taxonID	type	description	language	source
310187A95620FFD2FF790E0EFE653661.taxon	type_taxon	Type species Billibathynella humpreysi Cho, 2005 Other species B. wolframnoodti, B. ilgarariensis Hong and Cho, 2009	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A95620FFD2FF790E0EFE653661.taxon	diagnosis	Amended diagnosis (after Hong & Cho, 2009)	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A95620FFD2FF790E0EFE653661.taxon	description	Parabathynellidae body elongated and cylindrical. Antennula seven-segmented. Antenna seven-segmented. Labrum flat with numerous teeth (more than 20) on free margin. Molar process of mandible with more than 11 spines. Mandibular palp three times as long as wide. Maxilla four-segmented. Thoracopods I – VII with exopod of six or more segments. Male thoracopod VIII almost rectangular, longer than wide; protopod protruded at inner distal corner; epipod large, triangular, its distal part covering penial region of protopod; basipod without setae, inner margin of basipod drawn out into projection. Uropod with numerous spines on sympod; endopod with one or two distal spines, two plumose setae near base, and a protrusion on disto-outer margin, inner spines variable in number; exopod with numerous setae (more than 12). Anal operculum flat to slightly concave. Furcal rami elongated, with two large distal spines and numerous spines (more than 12) on inner margin.	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A95620FFD2FF790E0EFE653661.taxon	type_taxon	Type species Brevisomabathynella cooperi Cho, Park and Ranga Reddy, 2006 Other species B. cunyuensis Cho, Park and Ranga Reddy, 2006; B. magna, B. changjini, B. clayi, B. uramurdahensi, B. jundeeensis, B. parooensis, B. eberhardi, B. leijsi, B. hahni Cho and Humphreys, 2010.	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A95620FFD2FF790E0EFE653661.taxon	diagnosis	Amended diagnosis (after Cho & Humphreys, 2010) Body elongated or short and cylindrical or fat-bellied. Antennula seven-segmented. Antenna five-segmented. Labrum flat with numerous teeth on free margin. Mandibular palp one-segmented with one or three setae. Maxilla four-segmented. Thoracopods I – VII with exopod of two and more (2 – 12) segments. Male thoracopod VIII almost rectangular or oval, longer than wide; protopod protrudes at inner distal corner; epipod large, triangular, distal part covering penial region of protopod; basipod without setae, inner margin of basipod drawn out into projection. Uropod with numerous (7 – 20) spines on sympod; endopod with two terminal spines, one or two plumose setae near base, three terminal setae, protrusion on disto-outer margin, inner spines variable in number; exopod with numerous setae, without basiventral seta.	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A95627FFD2FF790BA2FD253091.taxon	diagnosis	Diagnosis: Body elongated with segments widening towards the posterior end. Antennula seven-segmented. Antenna five, six, or seven-segmented. Labrum flat. Incisor process of mandible with four or five teeth, molar process with five to nine claws, mandibular palp one-segmented with one seta. Distal endite of maxillula with five to seven claws. Maxilla four-segmented. Thoracopods I – VII with exopod of two to six articles. Male thoracopod VIII longer than wide; outer lobe rounded, trapezoidal or finger-like; basipod without setae; exopod and endopod small with or without setation or teeth-like setae. Sympod of the uropod with homonomous or non-homonomous spines; endopod of uropod with two terminal spines, inner spines, two or three plumose setae, two barbed terminal setae, and protrusion on disto-outer margin; exopod with or without basiventral seta. Furcal rami with few spines (six to 11). Included species: Nicolenella abramsae Perina and Camacho sp. nov., N. cassidis (Hong and Cho, 2009) comb. nov., N. floecknerae Perina and Camacho sp. nov., N. hueyi Perina and Camacho sp. nov., N. isabelleana Perina and Camacho sp. nov., N. mittrai Perina and Camacho sp. nov., N. morganae Perina and Camacho sp. nov., N. newtonorum Perina and Camacho sp. nov., N. nguyenae Perina and Camacho sp. nov., N. pilbaraensis (Hong and Cho, 2009) comb. nov., N. rodmani Perina and Camacho sp. nov., N. vanweesae Perina and Camacho sp. nov.	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A95627FFD2FF790BA2FD253091.taxon	discussion	Remarks: Nicolenella gen. nov. differs from Atopobathynella, Kimberleybathynella, Hexabathynella, Chilibathynella, and Onychobathynella by having the endopod of uropod without dagger / dagger + spines shape and exopod of thoracopods multi-segmented. It differs from the other Australian genera by the combination of characters listed in Table 5. This genus shares many characters with Brevisomabathynella and Billibathynella, including the multi-segmented exopods of thoracopods I – VII, the elongated ThVIII of the male, the small cone-shape ThVIII of female, endopod of uropod with more than 3 spines (for a complete comparison amongst species of Billibathynella, Brevisomabathynella and Nicolenella gen. nov. see Supplementary Material Table S 2). Billibathynella differs from Nicolenella gen. nov. by bigger size, many teeth on labrum (more than 21), many claws on pars molaris of the mandible (more than 11), many articles of the exopod of thoracopods (more than five), many spines on the sympod of the uropod (more than 10), many setae on the exopod of the uropod (more than 12), many spines on the endopod of the uropod (more than five), and many spines on furca (more than 16). Brevisomabathynella has very subtle differences compare to Nicolenella gen. nov., such as: AII five-segmented, while Nicolenella gen. nov. has six or seven (however two species of the new genus have AII five-segmented), the number of articles on the exopod of ThsII to VI is five or more, the number of spines on the sympod of the uropod is 10 or more. Both, Billibathynella and Brevisomabathynella have dentate lobe on the male ThVIII absent. Further support for the erection of a new genus is the geographic separation of the three genera, with Billibathynella and Brevisomabathynella collected from the Gascoyne and Murchison regions, and Nicolenella gen. nov. from the Pilbara region (Fig. 1), and the molecular phylogeny that defines three well supported clades (Fig. 2). However, future sampling in poorly sampled regions could redefine the status of these three genera. The 10 species of Nicolenella gen. nov. have very subtle differences listed in Supplementary Material Table S 2. Some major differences are the number of segments on AII (5 to 7), number of teeth on pars incisiva of the mandible (4 / 5), presence or absence of the inner seta on the first article of the endopod of ThsII to VII, homonomous or non-homonomous spines on sympod of uropod, presence or absence of a basiventral seta on the exopod of the uropod.	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A95627FFD2FF790BA2FD253091.taxon	etymology	Etymology. This genus is dedicated to Nicole Coineau, who worked extensively on stygofauna, and described many species of Bathynellacea Chappuis, 1915.	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A95624FFEBFF790991FB3536A9.taxon	description	(Figs. 3 – 5, Appendix 7 A) urn: lsid: zoobank. org: act: B 49 F 2992 - 6 FDA- 40 B 1 - 860 B- 3 B 948129773 A	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A95624FFEBFF790991FB3536A9.taxon	materials_examined	Material examined. Holotype male. AUSTRALIA: Western Australia: Miralga creek, Pilbara, bore ALB 0005 (stygo net haul), 20 ° 47 ' 32.2459 " S, 119 ° 19 ' 00.7342 " E, 16 May 2019, D. Main, P. Runham (WAMC 78891 - BES 8291, permanent slide). Paratypes AUSTRALIA: Western Australia: 1 male, bore ALB 0003, (stygo net haul), 20 ° 57 ' 45.9186 " S, 119 ° 17 ' 48.2640 " E, 11 July 2019, D. Main, P. Runham (WAMC 78889 - BES 7048, permanent slide); 1 male, bore ALB 0003, 16 May 2019, D. Main, P. Runham (WAMC 78890 - BES 7300, permanent slide); 1 female (WAMC 78892 - BES 8292, permanent slide), same details as holotype; 1 female, bore ALB 0066 (stygo net haul), 20 ° 46 ' 32.5898 " S, 119 ° 19 ' 10.9398 " E, 7 November 2019, F. Rudin, M. Lythe (WAMC 78895 - BES 8295, permanent slide); 1 male (WAMC 78896 - BES 8341, permanent slide), same details as WAMC 78895; 1 male, bore ALB 0067 (stygo net haul), 20 ° 46 ' 38.4946 " S, 119 ° 19 ' 09.2600 " E, 7 November 2019, F. Rudin, M. Lythe (WAMC 78897 - BES 8342, permanent slide); 1 female, bore ALB 0010, (stygo net haul), 20 ° 47 ' 31.1028 " S, 119 ° 19 ' 00.8501 " E, 11 July 2019, D. Main, P. Runham, (WAMC 78899 - BES 8344, permanent slide). Additional material. AUSTRALIA: Western Australia: 3 females, 2 males, 1 juvenile, (WAMC 82082 - BES 6039, in ethanol), same details as holotype; 1 male, 2 females, bore ALB 0005, 7 November 2019, F. Rudin, M. Lythe (WAMC 82083 - BES 6709, in ethanol); 27 specimen, bore ALB 0005, 11 July 2019, D. Main, P. Runham, (WAMC 82084 - BES 7059, in ethanol); 1 male, 1 female, bore ALB 0063, (stygo net haul), 20 ° 46 ' 32.5142 " S, 119 ° 19 ' 10.9135 " E, 12 September 2019, Fabian Rudin, Phil Runham (WAMC 82085 - BES 6575, in ethanol); 1 male (WAMC 78894 - BES 8294, in ethanol), same details as WAMC 82085; 5 males, 4 females (WAMC 82086 - BES 6607, in ethanol) same details as WAMC 78895; 1 male, 1 female (WAMC 82087 - BES 6467, in ethanol) same details as WAMC 78897; 1 male (WAMC 78898 - BES 8343, in ethanol) same details as WAMC 78897; 1 male, 1 female, 1 juvenile (WAMC 82088 - BES 7070, in ethanol) same details as WAMC 78899; 1 male, 5 juveniles, bore ALB 0010, 16 May 2019, D. Main, P. Runham, (WAMC 82089 - BES 7187, in ethanol); 1 male (WAMC 78900 - BES 8345, in ethanol) same details as WAMC 82089; 1 female, bore ALB 0010, 12 September 2019, (WAMC 82090 - BES 6181, in ethanol); 1 male, 1 female, bore ALB 0063, 10 July 2019, D. Main, P. Runham, (WAMC 78907 - BES 7313, in ethanol); 1 male, 1 female, bore ALB 0066, 16 May 2019, D. Main, P. Runham, (WAMC 78908 - BES 7174, in ethanol); 2 females, 2 juveniles, bore ALB 0066, D. Main, P. Runham, (WAMC 82091 - BES 7265, in ethanol); 2 females, 1 juvenile, bore ALB 0067, 16 May 2019, D. Main, P. Runham, (WAMC 82092 - BES 6755, in ethanol); 2 males, 1 female, bore ALB 0067, 10 July 2019, D. Main, P. Runham, (WAMC 82093 - BES 7263, in ethanol).	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A95624FFEBFF790991FB3536A9.taxon	diagnosis	Diagnosis. AI seven-segmented. AII six-segmented with fifth article very short. Mandibular palp one-segmented formed by one long article and one seta that does not extend beyond the distal end of the pars incisiva. Distal endite of maxillula with seven claws. Three to five articles on exopod of thoracopods. One internal seta on first article of endopod of ThII to VII. Male thoracopod VIII trapezoidal, about 1.5 times as long as wide. Sympod of the uropod with non-homonomous spines, with one or two distal spines longer than others; exopod of the uropod similar in length to endopod, with two distal setae. Furca with few small inner spines and two strong distal ones. It differs from all other species of Nicolenella gen. nov. by the combination of characters listed in Supplementary Material Table S 2. The sequenced specimens differ from all the other Nicolenella gen. nov., Billibathynella and Brevisomabathynella species sequenced by COI = 18.5 – 24.8 % and 12 S = 23.9 – 33.2 % (Table 3, Appendix 2, 3).	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A95624FFEBFF790991FB3536A9.taxon	description	Description male holotype (WAMC 78891). Body length 1.18 mm. Body nearly six times as long as maximum width elongated, almost cylindrical, segments slightly widening and lengthening towards posterior end of body (Appendix 7 A). Antennula (Fig. 3 A): seven-segmented, over two times longer than AII The first article is the longest, followed by the second, third and sixth articles, which are similar in length, fourth and fifth articles similar in length and the shortest, seventh article slightly longer. The last two articles with three terminal aesthetascs and the fifth one with only two. Antennular setation as in Fig. 3 A. Antenna (Fig. 3 B): six-segmented; the first three articles and the fifth are similar in length and very short; the fourth article is twice as long as the fifth, the last article is the longest and about three times the length of the fifth. Setal formula of AII: 0 + 0 / 0 + 0 / 1 + 1 / 1 + 1 / 0 + 0 / 4 (1). Labrum (Fig. 3 C): flat, free edge with 14 teeth. Paragnaths: absent. Mandible (Fig. 3 D): pars incisiva with four teeth; pars molaris with seven claws, the five distal denticulated, the two most proximal ones joined together; tooth of ventral edge triangular. Mandibular palp with one long article and the seta reaching the distal end of the pars distalis. Maxillula (Fig. 3 E): proximal endite with four unequal claws, the most proximal long and strong; distal endite with seven claws: two apical smooth and five denticulated; three smooth, unequal subterminal setae on the outer distal margin. Maxilla (Fig. 3 F): four-segmented, setal formula 3, 4,11, 4. Thoracopods I to VII (Figs. 4 A – G): length slightly increasing from thoracopod one to two, last five similar in size. Epipod present in all thoracopods, about half of the length of the corresponding basipod. All basipods with one distolateral seta similar or shorter than the first article of the endopod. Four-segmented exopod in thoracopod I, VI and VII and five-segmented on the rest of thoracopods; exopod of thoracopod I and VII shorter than corresponding three first articles of the endopod. Exopod of all thoracopods with two very long distal setae on each article. Number of exopodal segments of thoracopods I to VII: 4 - 5 - 5 - 5 - 5 - 4 - 4. Endopod four-segmented, first article short, half as long as the second and third, which are similar in length, and the fourth one is small in all thoracopods; first and second articles bearing an outer plumose seta and one smooth inner seta in all thoracopods, but ThI second article bears three inner setae; third article with one small outer distal seta on all thoracopods and one inner seta on ThI; fourth article very reduced with two strong claws of different length on all thoracopods and one smooth seta on ThI, II, VI and VII and two on ThIII to V. Setal formula of endopods as follow: ThI 1 + 1 / 3 + 1 / 1 + 1 / 3 (1) ThII 1 + 1 / 1 + 1 / 0 + 1 / 3 (1) ThIII to V 1 + 1 / 1 + 1 / 0 + 1 / 4 (2) ThVI - VII 1 + 1 / 1 + 1 / 0 + 1 / 3 (1) Thoracopod VIII (Fig. 5 A – D): compact, longer than wide. Penial region with massive protopod with frontal protrusion similar to the outer and the dentate lobe. Outer lobe rounded, reaching the distal end of basipod, and not defined at base in latero-external view. Dentate lobe with several distal teeth. Inner lobe trapezoidal slightly longer than outer lobe. Basipod reaching the penile projection, without seta. Endopod and exopod small with one spine-like seta each. Pleopod I (Fig. 5 F): one segmented with a long smooth seta. Uropod (Fig. 5 G): sympod nearly twice as long as the endopod and four times as long as wide, with six (on one side) and seven spines on the other (Fig. 5 G), with one or two distal spines slightly longer, occupying about half of the length of the sympod. Endopod as long as exopod, with two distal strong spines and three inner small ones, two dorsal plumose setae that exceed the tip of the endopod and two long distal barbed setae. Exopod with four barbed setae, two terminal and two dorsal. Pleotelson (Fig. 5 H): with one small plumose lateral seta on each side; anal operculum not protruded. Furca (Fig. 5 H): rami rectangular, with six and seven barbed spines; the five / six proximal thick and short and the two distal similar in size and twice the length of the basal ones. Two dorsal plumose setae, the inner one short and the outer one reaches the end of the distal spines. Female paratype differs from male in the small cone-shape thoracopod VIII (Fig. 5 E), the last segment of AII of female paratype WAMC 78892 is partially divided (Fig. 3 G). Variability: variability was observed in body size (males 0.83 – 1.18 mm and females 0.77 – 1.38 mm), number of teeth on labrum (10 – 14); number of exopodal articles on the thoracopods (3 – 5); number of spines on sympond of uropod (4 – 7) and number of spines on furcal rami (6 – 9). Some specimens have last article of AII partially divided (Fig. 3 G).	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A95624FFEBFF790991FB3536A9.taxon	distribution	Distribution and remarks. N. abramsae sp. nov. has been collected from six bores near Miralga creek, in the DeGrey River Catchment (Fig. 6). This species was previously known by Biologic Environmental Surveys as Parabathynellidae sp. “ Miralga ”. N. abramsae sp. nov. can be distinguished by the combination of characters listed in Supplementary Material Table S 2. It results genetically closely related to N. floecknerae sp. nov. and Parabathynellidae sp. 18 (N. sp. 18) both collected from the Fortescue River Catchment, about 200 and 250 km south and southeast (Fig. 6).	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A95624FFEBFF790991FB3536A9.taxon	etymology	Etymology. The name of the species is dedicated to Kym Abrams, colleague who works on subterranean fauna and described a few species of Parabathynellidae from Australia using an integrative approach.	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A9561EFFE7FF790BEAFF7A343D.taxon	description	(Figs. 7, 8, Appendix 7 B) urn: lsid: zoobank. org: act: 72 EA 9544 - E 7 EF- 465 C- 88 D 0 - FAF 72737 EB 73	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A9561EFFE7FF790BEAFF7A343D.taxon	materials_examined	Material examined. Holotype male. AUSTRALIA: Western Australia: Brockman, Pilbara, bore RC 17 BS 1 E 0314 (stygo net haul), 22 ° 31 ' 11.2861 " S, 117 ° 10 ' 13.7302 " E, 10 Jun 2019, S. Rodman, A. Williams (WAMC 78893 - BES 7089, permanent slide). Paratypes AUSTRALIA: Western Australia: 1 female, Brockman, Pilbara, Bore RC 17 BS 1 E 0304 (stygo net haul), 22 ° 31 ' 26.9409 " S, 117 ° 09 ' 40.7110 " E, 14 August 2019, F. Rudin, P. Runham (WAMC 79036 - BES 7560 - BMR 00645, permanent slide); 1 female, Brockman, Pilbara, Bore RC 17 BS 1 E 0304 (stygo net haul), 22 ° 31 ' 26.9409 " S, 117 ° 09 ' 40.7110 " E, 17 October 2020, M. Lythe, S. Floeckner (WAMC 79037 - BES 9110 a-BMR 02281, permanent slide); 1 male, same details as WAMC 79037 (WAMC 79038 - BES 9110 d-BMR 02284, permanent slide); 1 female, same details as WAMC 79037 (WAMC 79039 - BES 9110 e-BMR 02285, permanent slide). Additional material AUSTRALIA: Western Australia: 1 juvenile, 1 female, (WAMC 79040 - BES 7089, in ethanol) same details as holotype.	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A9561EFFE7FF790BEAFF7A343D.taxon	diagnosis	Diagnosis. AI seven-segmented. AII six-segmented with sixth article as long as fourth and fifth combined. Mandibular palp one-segmented formed by one long segment and one seta that does not extend beyond the distal end of the pars incisiva. Distal endite of maxillula with six claws. Two to four articles on exopod of thoracopods. Male thoracopod VIII rectangular, nearly two times as long as wide. Sympod of the uropod with non-homonomous spines, with the two distal ones slightly longer than the rest. Exopod and endopod similar in length; exopod without basiventral seta. Furca with few smaller inner spines and two distal ones more than twice as long as the rest. It differs from all other species of Nicolenella gen. nov. by the combination of characters listed in Supplementary Material Table S 2. The sequenced specimens differ from all the other Nicolenella gen. nov., Billibathynella and Brevisomabathynella species sequenced by COI = 11.8 – 21.6 % and 12 S = 12.9 – 33.7 % (Table 3, Appendix 2,3).	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A9561EFFE7FF790BEAFF7A343D.taxon	description	Description male holotype (WAMC 78893). Body length 1 mm. Body 7.5 times as long as maximum width, elongated, almost cylindrical, segments slightly widening and lengthening towards posterior end of body (Appendix 7 B). Antennula (Fig. 7 A): seven-segmented. Articles narrowing from the first to the last one. First article longest, followed by third, second and last articles, which are similar in length, and longer than fourth and fifth articles, sixth article shortest. Inner flagellum small. Article five with two and article six and seven with three terminal aesthetascs. Antennular setation as in Fig. 7 A. Antenna (Fig. 7 B): six-segmented; slightly longer than the first two segments of A 1, sixth segment as long as fourth and fifth ones combined. Setal formula: 0 + 0 / 0 + 0 / 1 + 1 / 1 + 1 / 0 + 0 / 4 (1). Plumose seta of distal segment shorter than the longest smooth seta. Labrum (Fig. 7 C): flat, free edge with 20 teeth. Paragnaths: absent. Mandible (Fig. 7 D): pars incisiva with four teeth; pars molaris with six strong claws, the two most proximal ones joined together; tooth of ventral edge small, triangular and rounded. Mandibular palp with one long distal seta reaching almost the end of the pars incisiva. Maxillula (Fig. 7 E): proximal endite with four unequal claws; distal endite with six claws: two apical smooth and four denticulate; three smooth subterminal setae on the outer distal margin. Maxilla (Fig. 7 F): four-segmented, setal formula 3, 4, 8, 7. Thoracopods I to VII (Figs. 8 A – G): length slightly increasing from thoracopod one to two and four to five, two and three, and six and seven similar in length. Epipod present in all thoracopod, about half the length of the corresponding basipod. All basipods with one distolateral seta slightly shorter than the first article of the endopod. Exopod of Th I shorter than endopod, similar in length in ThII and VII, slightly longer than endopod in ThIII to VI. Exopod of all thoracopods with two very long distal setae on each article. Number of exopodal segments of Ths I to VII 3 - 4 - 4 - 4 - 4 - 4 - 4. Endopod four-segmented, first article short, half as long as the second and third, which are similar, and the fourth one very small in all thoracopods; first and second article of all thoracopods bearing an outer plumose seta; first and second article of ThI bearing two smooth inner setae, second article of Th II to VII bearing one inner seta; third article with one small outer distal seta on all thoracopods; fourth article with two strong claws of different length and one smooth seta on all thoracopods. Endopod four-segmented, setal formula: ThI 2 + 1 / 2 + 1 / 0 + 1 / 3 (1) ThII to VII 0 + 1 / 1 + 1 / 0 + 1 / 3 (1) Thoracopod VIII (Fig. 7 G – J): almost rectangular, about twice as long as wide. Protopod big, with prominent penial region with terminal opening. Epipod (or outer lobe) large, sub-rectangular, distal part not reaching beyond exopod. Basipod sub-rectangular without setae, inner margin of basipod drawn out into projection (or crest). Dentate lobe with about 7 teeth, inner lobe short and subsquare. Exopod small without setae. Endopod bigger than exopod, with two terminal setae. Pleopod I (Fig. 8 H): one-segmented with a long seta 2.5 times the length of the segment. Uropod (Fig. 8 I): sympod nearly three times as long as wide, with seven spines, the two distal one slightly longer, occupying about half of its length. Endopod as long as exopod, with a protrusion on disto-outer margin (zoom of Fig. 8 I), two terminal and two inner spines, and two terminal, one subterminal and one proximal seta. Exopod with two terminal, and two outer barbed setae. Pleotelson (Fig. 8 J): with one small lateral plumose seta on each side; anal operculum not protruded. Furca (Fig. 8 J): trapezoidal, about 1.6 times longer than wide, with two large distal spines and seven smaller spines on inner margin, and two dorsal plumose setae of different length. Female paratypes differ from male in the small pointy thoracopod VIII (Fig. 7 K). Variability: variability was observed in body size (male 1 mm and females 0.70 – 0.85 mm), number of claws of pars molaris of mandible (4 to 6), number of segments of exopod of ThI to VII (2 - 3 - 3 - 3 - 4 - 3 - 2 / 3) and therefore length of exopod with respect to endopod of thoracopods (shorter or same length of endopod, where the holotype has exopod longer than endopod).	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A9561EFFE7FF790BEAFF7A343D.taxon	distribution	Distribution and remarks. N. rodmani sp. nov. has been collected in two bores near Boolegeeda creek (Ashburton River) (Fig. 6, 9 B). This species was previously known by Biologic Environmental Surveys as Parabathynellidae sp. “ Biologic-PBAT 003 ”. N. rodmani sp. nov. can be distinguished by the combination of characters listed in Supplementary Material Table S 2. It is part of a partially well-supported clade (Fig. 2) formed by one species collected in the Onslow River Catchment, and four species collected geographically close in the Ashburton River Catchment (N. nguyenae sp. nov., N. mittrai sp. nov., N. vanweesae sp. nov., N. hueyi sp. nov.) (Figs. 6, 9 B).	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A9561EFFE7FF790BEAFF7A343D.taxon	etymology	Etymology. The name of the species is dedicated to a colleague, Syngeon Rodman, one of the collectors of this species.	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A95612FFE3FF79099EFBCF3485.taxon	description	(Figs. 10, 11, Appendix 7 C) urn: lsid: zoobank. org: act: B 1 F 54 B 72 - 73 F 0 - 416 D-A 1 E 4 - 54 FB 2078278 B	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A95612FFE3FF79099EFBCF3485.taxon	materials_examined	Material examined. Holotype male. AUSTRALIA: Western Australia: Brockman, Pilbara, bore MB 19 BS 3 X 0009 (stygo net haul), 22 ° 29 ' 00.1817 " S, 117 ° 27 ' 33.0419 " E, 17 October 2020, M. Lythe, S. Floeckner (WAMC 79052 - BES 10082 _ BMR 02330, permanent slide). Paratypes AUSTRALIA: Western Australia: 1 male, Brockman, Pilbara, Bore GR 19 BS 3 X 0042 (stygo net haul), 22 ° 29 ' 43.9494 " S, 117 ° 26 ' 38.6520 " E, 18 October 2020, F. S. Rodman, M. van Wees (WAMC 79041 - BES 8275 b-BMR 02299, permanent slide); 1 female, Brockman, Pilbara, Bore MB 19 BS 3 X 0007 (stygo net haul), 22 ° 29 ' 19.5223 " S, 117 ° 27 ' 11.6734 " E, 20 February 2021, J. Huey, S. Rodman (WAMC 79043 - BES 11184 aBMR 02590, permanent slide); 1 male, same details as WAMC 79043 (WAMC 79044 - BES 11184 b-BMR 02591, permanent slide); 1 female, bore RC 11 BS 3007 (stygo net haul), 22 ° 29`28.22 " S, 117 ° 26`45.51 " E, 18 October 2020, F. S. Rodman, M. van Wees (WAMC 79057 - BES 10261 b-BMR 02293, permanent slide); 1 female, bore RC 19 BS 3 X 0354 (stygo net haul), 22 ° 28 ' 56.6569 " S, 117 ° 27 ' 27.0029 " E, 20 February 2021, F. S. Rodman, M. van Wees (WAMC 79065 - BES 10016 e-BMR 02597, permanent slide). Additional material AUSTRALIA: Western Australia: 2 males, 2 females, same details as WAMC 79043 (WAMC 79042 - BES 10408, in ethanol); 1 female, same details as WAMC 79044 (WAMC 79045 - BES 11184 c-BMR 02592, in ethanol); 1 female, bore MB 19 BS 3 X 0007, 18 October 2020, S. Rodman, M. van Wees, (WAM C 79046 - BES 10325 aBMR 02287, in ethanol); 1 female, (WAMC 79047 - BES 10325 b-BMR 02288, in ethanol), 1 male (WAMC 79048 BES 10325 c-BMR 02289 ,, in ethanol), 1 male (WAMC 79049 - BES 10325 d-BMR 02290, in ethanol), 1 male (WAMC 79050 - BES 10325 e-BMR 02291, in ethanol), same details as WAMC 79046; 1 female (WAMC 79051 - BES 11184 d, in ethanol) same details as WAMC 79043; 1 female, bore RC 11 BS 3007, 10 October 2018, S. Rodman, T. de Silva (WAMC 79053 - BES 4211 - BMR 00480, in ethanol); 1 male (WAMC 79054 - BES 4253 - BMR 00246, in ethanol), 1 juvenile (WAMC 79055 - BES 4435 - BMR 00418, in ethanol), 1 specimen (sex not available) (WAMC 79056 - BES 7592 - BMR 00420, in ethanol) same details as WAMC 79053; 1 female (WAMC 79058 - BES 10261 cBMR 02294, in ethanol) same details as WAMC 79057; 1 female, bore RC 11 BS 3007, 10 October 2018, S. Rodman, T. de Silva (WAMC 79059 - BES 4393 - BMR 00604, in ethanol); 1 juvenile (WAMC 79060 - BES 4881, in ethanol) same details as WAMC 79059; 3 juveniles, bore RC 11 BS 3007, 14 April 2019, S. Callan, M. Lythe (WAMC 79061 - BES 5141, in ethanol); 1 male, RC 11 BS 3007, 10 October 2018 S. Rodman, T. de Silva (WAMC 79062 - BES 5986, in ethanol); 10 specimens, bore RC 11 BS 3007, 14 April 2019, S. Callan, M. Lythe (WAMC 79063 - BES 6008, in ethanol); 1 male (WAMC 79064 - BES 10016 c-BMR 02595, in ethanol), 1 male (WAMC 79066 - BES 10016 d, in ethanol), 1 female (WAMC 79067 - BES 10016 f, in ethanol), 38 specimens (WAMC 79068 - BES 10016 g, in ethanol), same details as WAMC 79065; 1 male, bore RC 19 BS 3 X 0366 (stygo net haul), 22 ° 28 ' 50.6100 " S, 117 ° 27 ' 10.8014 " E, 20 February 2021, J. Huey, S. Rodman (WAMC 79069 - BES 11104 - BMR 02589).	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A95612FFE3FF79099EFBCF3485.taxon	diagnosis	Diagnosis. AI seven-segmented with the fifth article very small. AII six-segmented with the fifth article as small as the first three. Mandibular palp formed by one long segment and one seta that does not extend beyond the distal end of the pars incisiva. Distal endite of maxillula with six claws. Two to four articles on exopod of thoracopods. Male thoracopod VIII trapezoidal, about 1.5 times as long as wide. Sympod of the uropod with non-homonomous spines, with the two distal ones longer than the rest. Exopod and endopod similar in length; exopod without basiventral seta. Furca with few smaller inner spines and two distal ones twice as long as the rest. It differs from all other species of Nicolenella gen. nov. by the combination of characters listed in Supplementary Material Table S 2. The sequenced specimens differ from all the other Nicolenella gen. nov., Billibathynella and Brevisomabathynella species sequenced by COI = 11.8 – 29.1 % and 12 S = 11.2 – 36.5 % (Table 3, Appendix 2, 3).	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A95612FFE3FF79099EFBCF3485.taxon	description	Description male holotype (WAMC 79052). Body length 0.75 mm. Body nearly six times as long as maximum width, elongated, almost cylindrical, segments slightly widening and lengthening towards posterior end of body (Appendix 7 C). Antennula (Fig. 10 A): seven-segmented, slightly longer than two times AII. The first article is the longest, followed by the second, third and seventh that are similar in length, the fourth and sixth are slightly shorter and similar in length and double the length of the fifth, which is the shortest. Inner flagellum rectangular. The last two articles with three terminal aesthetascs, and two aesthetascs on the fifth article. Antennular setation as in Fig. 10 A. Antenna (Fig. 10 B): six-segmented; the first three articles and the fifth are very short and similar in length; the fourth article is twice as long as the fifth, the last article is the longest and about three times the length of the fifth. Setal formula of AII: 0 + 0 / 0 + 0 / 1 + 1 / 1 + 1 / 0 + 0 / 4 (1). Labrum (Fig. 10 C): flat, free edge with 10 teeth. Paragnaths: absent. Mandible (Fig. 10 D): pars incisiva with four teeth; pars molaris with five and six claws, the four distal ones denticulated and the two most proximal ones joined together; tooth of ventral edge triangular. Mandibular palp with one long article and the seta reaching the distal end of the pars molaris. Maxillula (Fig. 10 E): proximal endite with four unequal claws, the most proximal one long and strong; distal endite with six claws: two apical smooth and four denticulated; three smooth, unequal subterminal setae on the outer distal margin. Maxilla (Fig. 10 F): four-segmented, setal formula 3,4,13,2. Thoracopods I to VII (Figs. 11 A – G): length slightly increasing from thoracopod one to four, last three similar in size. Epipod present in all thoracopods, about half of the length of the corresponding basipod. All basipods with one distolateral seta shorter than the first article of the endopod on ThI and VII, and the same length as the first article in other thoracopods. Exopod of ThI, VI and VII shorter than endopod, exopod similar to endopod in ThII to V. Exopod of all thoracopods with two very long distal setae on each article (ThVI has one exopod with three setae on the first article). Number of exopodal segments of thoracopods I – VII: 2 - 3 - 3 - 3 - 3 - 2 - 2. Endopod four-segmented, first article short, half as long as the second and third, which are similar, and the fourth one very small in all thoracopods; first and second article of all thoracopods bearing an outer plumose seta; first and second article of ThI bearing two smooth inner setae, first and second article bearing respectively zero and one inner seta in other thoracopods; third article with one small outer distal seta on all thoracopods, and one inner seta on ThI only; fourth article with two strong claws of different length and one smooth seta on all thoracopods. Setal formula of endopods as follow: ThI 2 + 1 / 2 + 1 / 1 + 1 / 3 (1) ThII-VII 0 + 1 / 1 + 1 / 0 + 1 / 3 (1) Thoracopod VIII (Fig. 10 G, H): compact, almost square. Penial region with massive protopod. Long rounded outer lobe, not reaching the distal end of basipod, and not fully defined at base in latero-external view. Dentate lobe with several distal teeth. Inner lobe longer than outer lobe reaching the distal end of basipod. Basipod without seta and with anterior crest (or projection). Exopod with a pair of short setae and larger than endopod, which bears two unequal distal setae. Pleopod I (Fig. 11 H): one segmented with a long smooth seta. Uropod (Fig. 11 I): sympod about 2.6 times longer than wide and 1.7 times longer than endopod and exopod, which are similar in length, with five spines, the two distal ones slightly longer than others, occupying half of the sympod length. Endopod with two distal strong spines and two smaller inner ones, two plumose dorsal setae (one proximal, one subdistal) that exceed the end of the endopod, and two long barbed distal setae of different length. Exopod with four barbed setae, two terminal and two dorsal of increasing length from the basal one. Pleotelson (Fig. 11 J): with one very small plumose lateral seta on each side; anal operculum not protruded. Furca (Fig. 11 J): trapezoidal, slightly longer than wide, with two large distal barbed spines and four smaller ones on the inner margin. Two dorsal plumose setae, the inner one short and the outer one reaching beyond the end of the distal spine. Female paratypes differ from male in the small triangular shape ThVIII (Fig. 10 I). Variability: variability was observed in body size (males 0.72 – 1.13 mm and females 0.85 – 1.7 mm); number of exopodal articles on the thoracopods (2 to 4); number of spines on sympod of uropod (5 to 7) and number of spines on furcal rami (6 to 8).	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A95612FFE3FF79099EFBCF3485.taxon	distribution	Distribution and remarks. N. hueyi sp. nov. has been collected in six bores near Boolegeeda creek (Ashburton River) (Fig. 6, 9 B). This species was previously known by Biologic Environmental Surveys as Parabathynellidae sp. “ Biologic-PBAT 004 ”. N. hueyi sp. nov. can be distinguished by the combination of characters listed in Supplementary Material Table S 2. It is part of a partially well-supported clade (Fig. 2) formed by one species collected in the Onslow River Catchment, and four species collected geographically close in the Ashburton River Catchment (N. nguyenae sp. nov., N. mittrai sp. nov., N. vanweesae sp. nov., N. rodmani sp. nov.) (Figs. 6, 9 B).	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A95612FFE3FF79099EFBCF3485.taxon	etymology	Etymology. The name of the species is dedicated to Joel Huey, one of the collectors of this species and colleague who has extensively worked on the genetic aspect of Parabathynellidae in Australia.	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A95616FFFFFF7909C6FDA33619.taxon	description	(Figs. 12, 13, Appendix 7 D) urn: lsid: zoobank. org: act: CBA 69 BF 5 - D 5 BA- 4633 - 9 E 53 - 84 EFB 06 F 06 A 9	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A95616FFFFFF7909C6FDA33619.taxon	materials_examined	Material examined. Holotype female. AUSTRALIA: Western Australia: Brockman, Pilbara, bore RC 17 BS 30052 (stygo net haul), 22 ° 33 ' 42.1097 " S, 117 ° 23 ' 55.8442 " E, 19 October 2020, M. Lythe, S. Floeckner (WAMC 79071 - BES 8393 c-BMR 02302, permanent slide). Paratypes AUSTRALIA: Western Australia: 1 female, (WAMC 79070 - BES 8393 b-BMR 02301, In ethanol) same details as holotype; 1 male, (WAMC 79072 - BES 8393 d _ BMR 02303, permanent slide) and 1 male (WAMC 79073 - BES 8393 e-BMR 02304, permanent slide) same details as holotype; 1 juvenile, bore RC 18 BS 30067 (stygo net haul), 22 ° 33`49.75 " S, 117 ° 23`31.96 " E, 16 December 2018, S. Rodman, A. Slabber (WAMC 79074 - BES 4339 - BMR 00541, permanent slide); 1 female (WAMC 79089 - BES 4097 - BMR 00544, permanent slide) same details as WAMC 79074; 1 female, bore RC 18 BS 30067, 16 April 2019, S. Callan, M. Lythe (WAMC 82098 - BES 6477). Additional material. AUSTRALIA: Western Australia: 1 male (WAMC 79076 - BES 4459 - BMR 00606, in ethanol) same details as WAMC 79074; 1 female, bore RC 18 BS 30067 (stygo net haul), 16 April 2019, S. Callan, M. Lythe (WAMC 79075 - BES 6852 - BMR 00419, in ethanol); 1 female (WAMC 79090 - BES 6477, in ethanol) same details as WAMC 82098; 1 female (WAMC 79035 - BES 4927 - BMR 00601, permanent slide) same details as WAMC 79089.	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A95616FFFFFF7909C6FDA33619.taxon	diagnosis	Diagnosis. AI seven-segmented. AII six-segmented with sixth article as long as fourth and fifth combined. Mandibular palp one-segmented formed by one long segment and one seta that does not extend beyond the distal end of the pars incisiva. Distal endite of maxillula with six claws. Two to four articles on exopod of thoracopods. Male thoracopod VIII rectangular, about 1.5 times as long as wide. Sympod of the uropod with non-homonomous spines, with the two distal ones slightly longer than others. Exopod and endopod similar in length, exopod without basiventral seta. Furca with few smaller inner spines and two distal ones twice as long as the rest. It differs from all other species of Nicolenella gen. nov. by the combination of characters listed in Supplementary Material Table S 2. The sequenced specimens differ from all the other Nicolenella gen. nov., Billibathynella and Brevisomabathynella species sequenced by COI = 11.4 – 23.3 % and 12 S = 5 – 31.2 % (Table 3, Appendix 2, 3).	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A95616FFFFFF7909C6FDA33619.taxon	description	Description female holotype (WAMC 79071). Body length 0.93 mm. Body six times as long as maximum width, elongated, almost cylindrical, segments slightly widening and lengthening towards posterior end of body (Appendix 7 D). Antennula (Fig. 12 A): seven-segmented. Articles narrowing from the first to the last one. First article longest, followed by third, sixth, second and seventh, with the last two similar in length, fourth article is the shortest, followed by the fifth. Inner flagellum small. Article five with two and article six and seven with three terminal aesthetascs. Antennular setation as in Fig. 12 A. Antenna (Fig. 12 B): six-segmented; slightly longer that the first two segments of A 1, sixth segment as long as third and fourth combined. Setal formula: 0 + 0 / 0 + 0 / 1 + 1 / 1 + 1 / 0 + 0 / 4 (1). Plumose seta of distal segment shorter than the longest smooth seta. Labrum (Fig. 12 C): flat, free edge with 12 teeth. Paragnaths: absent. Mandible (Fig. 12 D): pars incisiva with four teeth; pars molaris with six strong claws, the two most proximal ones joined together; tooth of ventral edge small and triangular. Mandibular palp with one long distal seta reaching the end of the pars incisiva. Maxillula (Fig. 12 E): proximal endite with four unequal claws; distal endite with six claws: two apical smooth and four denticulate; three smooth subterminal setae on the outer distal margin. Maxilla (Fig. 12 F): four-segmented, setal formula 3, 3, 10, 4. Thoracopods I to VII (Figs. 13 A – G): length slightly increasing from thoracopod one to five, six and seven similar in length. Epipod present in all thoracopods, about half the length of the corresponding basipod, or less. All basipods with one distolateral seta about as long as the first article of the endopod. Exopod shorter than endopod in ThI and II, and about the same length in ThIII to VII. Exopod of all thoracopods with two very long distal setae on each article (ThVI has one exopod with three setae on the first article). Number of exopodal segments of thoracopods I – VII: 3 - 4 - 4 - 4 - 4 - 4 - 3. Endopod four-segmented, first article short, about half as long as the second and third, which are similar, and the fourth one very small in all thoracopods; first and second article of all thoracopods bearing an outer plumose seta; first and second article of ThI bearing two smooth inner setae, second article bearing one inner seta in other thoracopods; third article with one small outer distal seta on all thoracopods, and one inner seta on ThI only; fourth article with two strong claws of different length and one smooth seta on all thoracopods. Endopod four-segmented, setal formula: ThI 2 + 1 / 2 + 1 / 1 + 1 / 3 (1) ThII to VII 0 + 1 / 1 + 1 / 0 + 1 / 3 (1) Thoracopod VIII (Fig. 12 G): small and conical. Pleopod I (Fig. 12 H): one-segmented with a long seta slightly longer than the length of the segment. Uropod (Fig. 13 H): sympod nearly three times as long as wide, with seven spines, the two distal one slightly longer, occupying about half of its length. Endopod as long as exopod, with a protrusion on disto-outer margin, two terminal and two inner spines, and two terminal, one subterminal, and one proximal seta. Exopod with two terminal, and two outer barbed setae. Pleotelson (Fig. 12 I): with one small lateral seta on each side; anal operculum not protruded. Furca (Fig. 12 I): sub-square, with two large distal spines and five smaller spines on inner margin, and two dorsal plumose setae of different length. Male paratypes differ from female in the thoracopod VIII (Fig. 13 I, J), which is compact, elongated, with penial region with massive protopod. Long rounded and bilobed outer lobe, reaching beyond the distal end of basipod, and not fully defined at base in latero-external view. Dentate lobe with several distal teeth. Basipod without setae and with anterior crest (or projection). Exopod with a pair of short setae, and endopod slightly longer, with two subequal distal setae. Variability: variability was observed in body size (male 0.75 – 1.02 mm and females 0.92 – 1.04 mm), number of claws of pars molaris of Md (6 – 7), number of segments of exopod of ThI to VII (2 / 3 - 3 / 4 - 3 / 4 - 3 / 4 - 3 / 4 - 3 / 4 - 2 / 4), number on spines on sympod (6 – 10), and number of spines on furca (6 – 9).	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A95616FFFFFF7909C6FDA33619.taxon	distribution	Distribution and remarks. N. mittrai sp. nov. has been collected in two bores near Boolegeeda creek (Ashburton River) (Fig. 6, 9 B). This species was previously known by Biologic Environmental Surveys as Parabathynellidae sp. “ Biologic-PBAT 005 ”. N. mittrai sp. nov. can be distinguished by the combination of characters listed in Supplementary Material Table S 2. It is part of a partially well-supported clade (Fig. 2) formed by one species collected in the Onslow River Catchment, and four species collected geographically close in the Ashburton River Catchment (N. nguyenae sp. nov., N. hueyi sp. nov., N. vanweesae sp. nov., N. rodmani sp. nov.) (Figs. 6, 9 B).	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A95616FFFFFF7909C6FDA33619.taxon	etymology	Etymology. The name of the species is dedicated to Anton Mittra, colleague who has extensively sampled stygofauna in the arid zones of WA.	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A9560AFFFBFF790B7AFF7A34CD.taxon	description	(Figs. 14 – 16, Appendix 7 E) urn: lsid: zoobank. org: act: DBE 1 FF 63 - 5953 - 459 D- 807 A-F 710 C 2 DD 5 FF 3	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A9560AFFFBFF790B7AFF7A34CD.taxon	materials_examined	Material examined. Holotype male. AUSTRALIA: Western Australia: Brockman, Pilbara, bore GR 19 BS 3 X 0047 (stygo net haul), 22 ° 31 ' 45.0735 " S, 117 ° 25 ' 30.1994 " E, 23 February 2021, J. Huey, S. Rodman (WAMC 79079 - BES 10271 c-BMR 02587, permanent slide). Paratypes AUSTRALIA: Western Australia: 1 female, (WAMC 79077 - BES 10271 a-BMR 02585, permanent slide), 1 female, (WAMC 79078 - BES 10271 b-BMR 02586, in ethanol), and 1 male (WAMC 79080 - BES 10271 dBMR 02588, in ethanol) same details as holotype; 1 male, bore MB 19 BS 3 X 0001 (stygo net haul), 22 ° 32 ' 19.4220 " S, 117 ° 25 ' 27.2716 " E, 19 October 2020, S. Rodman, M. van Wees (WAMC 79081 - BES 8362 b-BMR 02296, permanent slide); 1 female (WAMC 79082 - BES 8362 c-BMR 02297, permanent slide) same details as WAMC 79081. Additional material. AUSTRALIA: Western Australia: 1 juvenile, bore MB 19 BS 3 X 0002, (stygo net haul), 22 ° 31 ' 56.7217 " S, 117 ° 25 ' 42.3851 " E, 22 February 2021, J. Huey, S. Rodman (WAMC 79083 - BES 11198 - BMR 02464, in ethanol), 1 specimen (sex not available), bore MB 19 BS 3 X 0002, 19 October 2020, S. Rodman, M. van Wees (WAMC 79084 - BES 8093 - BMR 02286, in ethanol), 1 juvenile, bore RC 19 BS 3 X 0337 (stygo net haul), 22 ° 31 ' 49.8274 " S, 117 ° 25 ' 35.1412 " E, 22 February 2022, J. Huey, S. Rodman (WAMC 79085 - BES 10747 - BMR 02465, in ethanol).	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A9560AFFFBFF790B7AFF7A34CD.taxon	diagnosis	Diagnosis. AI seven-segmented with all articles similar in length, except article one. AII six-segmented, less than half of the length of AI. Mandibular palp one-segmented formed by one long article and one seta that does not extend beyond the distal end of the pars incisiva. Distal endite of maxillula with six claws. Two to four articles on exopod of thoracopods. Male thoracopod VIII rectangular, one and about 1.5 times as long as wide. Sympod of the uropod with non-homonomous spines, with a different combination of slightly longer spines (for example, one to three distal spines can be longer than others, or the proximal spine can be shorter, (see photos in Appendix 8). Exopod and endopod similar in length; exopod without basiventral seta. Furca with few smaller inner spines and two distal ones twice as long as the rest. It differs from all other species of Nicolenella gen. nov. by the combination of characters listed in Supplementary Material Table S 2. The sequenced specimens differ from all the other Nicolenella gen. nov., Billibathynella and Brevisomabathynella species sequenced by COI = 12.1 – 24.8 % and 12 S = 5 – 32 % (Table 3, Appendix 2,3).	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A9560AFFFBFF790B7AFF7A34CD.taxon	description	Description male holotype (WAMC 79079). Body length of 1.13 mm. Body six times as long as maximum width, elongated, almost cylindrical, segments slightly widening and lengthening towards posterior end of body (Appendix 7 E). Antennula (Fig. 14 A): seven-segmented, over two times longer than AII. The first article is the longest, the second, third and seventh are similar in length, the fourth and fifth are similar in length and slightly shorter than the sixth article. Inner flagellum small and trapezoidal. Article five with two and article six and seven with three terminal aesthetascs. Antennular setation as in Fig. 14 A. Antenna (Fig. 14 B): six-segmented; first two articles very small and similar in length; third article slightly longer than the first two; fourth and fifth articles slightly longer than article three, and article six is the longest. Setal formula of AII: 0 + 0 / 0 + 0 / 1 + 1 / 1 + 1 / 0 + 0 / 4 (1). Labrum (Fig. 14 C): flat, free edge with 13 teeth. Paragnaths: absent. Mandible (Fig. 14 E): pars incisiva with four teeth; pars molaris with six claws, the four distal ones denticulated, the two most proximal ones joined together; tooth of ventral triangular. Mandibular palp with one long article and seta reaching the distal end of the pars molaris. Maxillula (Fig. 14 F): proximal endite with four unequal claws; distal endite with six claws: two apical smooth and four denticulated; three smooth, unequal subterminal setae on the outer distal margin. Maxilla (Fig. 14 G): four-segmented, setal formula 3, 3,12,4. Thoracopods I to VII (Figs. 15 A – G): length slightly increasing from thoracopod one to five, last two similar in size. Epipod present in all thoracopod, about half or more of the length of the corresponding basipod. Basipod bearing one distolateral seta similar in length to the first article of the endopod in all thoracopods. Exopod of ThI slightly longer than the first two endopodal articles, exopod longer than endopod in ThIII to V and similar in length in thoracopod II, VI and VII. Exopod of all thoracopods with two distal setae on each article. Number of exopodal segments of Ths I to VII 3 - 4 - 4 - 4 - 4 - 4 - 4 - 4. Endopod four-segmented, first article shorter than second and third articles, which are similar in length, and article four small in all thoracopods; first and second article bearing an outer plumose seta in all thoracopods, two inner smooth setae on second and third article on ThI, and only one inner smooth seta on the second article on the rest of thoracopods; third article with one small outer distal seta on all thoracopods, ThI third article with also an inner seta; fourth article with two strong claws of different length and one smooth seta on all thoracopods. Setal formula of endopods as follow: ThI 2 + 1 / 2 + 1 / 1 + 1 / 3 (1) ThII-VII 0 + 1 / 1 + 1 / 0 + 1 / 3 (1) Thoracopod VIII (Fig. 14 H – K): rectangular, elongated, longer than wide; penial region with massive protopod; long trapezoidal outer lobe with complete basal delimitation, reaching the distal end of basipod and fully defined at base in latero-external view. Dentate lobe with several distal teeth. Inner lobe very short. Basipod without setae, with anterior projection (or crest). Very small exopod with a pair of distal setae and small endopod with two distal setae. Pleopod I (Fig. 15 H): one segmented with a long smooth seta. Uropod (Fig. 16 A, Appendix 8) sympod over two times longer than endopod and exopod, which are similar in length, and about five times as long as wide, with nine spines, the distal one slightly longer than the others (on one side, Fig. 16 A), while, on the other side, the second most distal spine is the longest (Appendix 8); spines occupy half of its length. Endopod with two distal strong spines and two inner ones smaller, with two long plumose dorsal setae that exceed the tip of the endopod and two distal barbed long setae. Exopod with five barbed setae, three terminal and two dorsal similar in length. Pleotelson (Fig. 16 B): with one very small plumose lateral seta on each side; anal operculum not protruded, flat. Furca (Fig. 16 B): rectangular rami, with eight (one side) and nine (other side) barbed spines, with the two distal ones longer and stronger. Two dorsal plumose setae, the inner one short and the outer one double the length of the distal spines. Female differs from male in the small triangular ThVIII (Fig. 14 L). Variability: variability was observed in body size (males 0.96 – 1.13 mm and females 0.82 – 1.5 mm); number of teeth on labrum (11 – 14) (Fig. 14 D), number of exopodal articles on the thoracopods (2 – 4); number of spines on sympod of uropod (5 – 9) and number of spines on furcal rami (7 – 10).	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A9560AFFFBFF790B7AFF7A34CD.taxon	distribution	Distribution and remarks. N. vanweesae sp. nov. has been collected in four bores near Boolegeeda creek (Ashburton River) (Fig. 6, 9 B). This species was previously known by Biologic Environmental Surveys as Parabathynellidae sp. “ Biologic-PBAT 012 ”. N. vanweesae sp. nov. can be distinguished by the combination of characters listed in Supplementary Material Table S 2. It is part of a partially supported clade (Fig. 2) formed by one species collected in the Onslow River Catchment, and four species collected geographically close by in the Ashburton River Catchment (N. nguyenae sp. nov., N. hueyi sp. nov., N. mittrai sp. nov., N. rodmani sp. nov.) (Figs. 6, 9 B).	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A9560AFFFBFF790B7AFF7A34CD.taxon	etymology	Etymology. The name of the species is dedicated to a colleague, Mary van Wees, one of the collectors of this species.	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A9560EFFF7FF790E0EFF7A37D1.taxon	description	(Figs. 17, 18, Appendix 7 F) urn: lsid: zoobank. org: act: A 6 F 05771 - CBAA- 4517 - 9420 - 85082 F 7 E 7 B 39	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A9560EFFF7FF790E0EFF7A37D1.taxon	materials_examined	Material examined. Holotype male. AUSTRALIA: Western Australia: Boolgeeda Creek, Pilbara, bore PZ 06 BS 4 B 007 (stygo net haul), 22 ° 33 ' 55.9177 " S, 117 ° 15 ' 30.6612 " E, 26 June 2019, M. Lythe, K. Nguyen (WAMC 78901 - BES 6457 - BMR 00621, permanent slide). Paratypes AUSTRALIA: Western Australia: 1 female, bore PZ 06 BS 4 B 006 (stygo net haul), 22 ° 33 ' 58.4763 " S, 117 ° 13 ' 28.3894 " E, 20 February 2021, P. Runham, S. Floeckner (WAMC 79086 - BES 10698 a-BMR 02461, permanent slide), 1 male, (WAMC 79087 - BES 10698 c-BMR 02463, permanent slide); 1 male and 1 female (WAMC 79088 - BES 7230, in ethanol), same details as holotype; 1 female, (WAMC 78902 - BES 7230, permanent slide) same details as holotype.	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A9560EFFF7FF790E0EFF7A37D1.taxon	diagnosis	Diagnosis. AI seven-segmented. Antennula 2.5 times longer than antenna. AII six-segmented with the last article very long. Mandibular palp one-segmented formed by one long article and one seta that extends beyond the distal end of the pars incisiva. Distal endite of maxillula with six claws. Two to five articles on exopod of thoracopods. Male thoracopod VIII rectangular, very elongated, two times as long as wide. Sympod of the uropod 2.5 times the length of the exopod and endopod which are similar in length, with homonomous spines; exopod of the uropod with three distal setae and dorsal basal setae. Furca with long spines, the two distal ones slightly longer than the rest. It differs from all other species of Nicolenella gen. nov. by the combination of characters listed in Supplementary Material Table S 2. The sequenced specimens differ from all the other Nicolenella gen. nov., Billibathynella and Brevisomabathynella species sequenced by COI = 14.7 – 23.6 % and 12 S = 17.2 – 37 % (Table 3, Appendix 2, 3).	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A9560EFFF7FF790E0EFF7A37D1.taxon	description	Description male holotype (WAMC 78901). Body length of 1.38 mm. Body nearly six times as long as maximum width elongated, almost cylindrical, segments slightly widening and lengthening towards posterior end of body (Appendix 7 F). The description of ThIII to VII is based on female paratype WAMC 78902, because holotype’s legs were subsampled for DNA. We chose WAMC 78901 as holotype, since it is bigger than other males and ThVIII is clearer. Antennula (Fig. 17 A): seven-segmented, almost three times longer than AII. The first three articles are similar in length to the last four together. The first article is the longest, followed by the third and sixth, which are similar in length, and slightly longer than the second one, which is longer than the fourth and seventh which are similar in length, fifth article is the smallest. Inner flagellum small and rectangular. The last two articles with three terminal aesthetascs and the fifth with only two. Antennular setation as in Fig. 17 A. Antenna (Fig. 17 B): six-segmented, the first four articles are as long as the last two together; the first three articles are very small and the sixth is the longest. Setal formula of AII: 0 + 0 / 0 + 0 / 1 + 1 / 1 + 1 / 0 + 0 / 4. Labrum (Fig. 17 C): flat, free edge with 17 teeth. Paragnaths: absent. Mandible (Fig. 17 D): pars incisiva with four teeth; pars molaris with seven claws, the five distal ones denticulated, and the two most proximal ones joined together; tooth of ventral edge triangular. Mandibular palp with one long article and one seta exceeding the distal end of the pars incisiva. Maxillula (Fig. 17 E): proximal endite with four unequal claws; distal endite with six claws: two apical smooth and four denticulated; three smooth, unequal subterminal setae on the outer distal margin. Maxilla (Fig. 17 F): four-segmented, setal formula 3, 4,14,2. Thoracopods I to VII (Figs. 18 A – I): length slightly increasing from thoracopod one to seven. Epipod present in thoracopod I to IV, about half of the length of the corresponding basipod. All basipods with one distolateral seta shorter than the first article of the endopod in all thoracopods. Exopod of ThI almost as long as the three first endopodal articles, similar to the length of the endopod in ThII to VI, shorter in ThVII. Exopod of all thoracopod with two distal setae on each article except the first article of ThI that have three setae. Number of exopodal segments of thoracopods I – VII: 3 - 4 - 5 - 5 - 5 - 5 - 4. Endopod four-segmented, first article shorter than second and third articles, second and third articles similar in length, and fourth article very short in all thoracopods; first and second articles bearing an outer plumose seta in all thoracopods, two inner smooth setae on second and third articles on ThI, and one inner smooth seta on the second article in ThII to VII; third article with one short outer distal seta in ThI to VII, and one inner seta on ThI; fourth article with two strong claws of different length and one smooth seta on all thoracopods. Setal formula of endopods as follow: ThI 2 + 1 / 2 + 1 / 1 + 1 / 3 (1) ThII to VII 0 + 1 / 1 + 1 / 0 + 1 / 3 (1) Thoracopod VIII (Fig. 17 G-J): rectangular, very elongated, two times longer than wide; penial region with massive protopod; outer lobe long, finger-like, without basal delimitation, reaching the distal end of basipod. Dentate lobe with several distal teeth. Inner lobe as long as outer lobe. Basipod without setae and with an anterior projection (or crest). Small, exopod with tooth, and small endopod with two distal setae similar in length. Pleopod I (Fig. 18 J): one segmented with a long plumose seta. Uropod (Fig. 18 K): sympod nearly three times longer than endopod and exopod (which are similar in length), and about five times as long as wide, with a row of seven homonomous spines, occupying about half of its length. Endopod with two strong distal and three small inner spines, two dorsal plumose setae, one of which exceeds the tip of the distal spines, two long distal barbed setae. Exopod with six barbed setae, three long terminal ones, two short dorsal ones, and one short basiventral seta. Pleotelson (Fig. 18 L): anal operculum slightly protruded. Furca (Fig. 18 L): trapezoidal rami, with 11 barbed spines; the nine proximal one thin, and slightly shorter than the two distal ones, which are thicker. Two dorsal plumose setae, the inner one short and the outer one reaches the tip of the distal spines. Female differs from male in the small cone shaped ThVIII (Fig. 17 K). Variability: variability was observed in body size (males 1.13 – 1.38 mm and females 1.43 – 1.85 mm); number of teeth of labrum (14 – 18); number of exopodal articles on the thoracopods (3 – 5); number of spines on sympod of uropod (7 – 9) and number of spines on furcal rami (8 – 11).	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A9560EFFF7FF790E0EFF7A37D1.taxon	distribution	Distribution and remarks. N. nguyenae sp. nov. has been collected in two bores near Boolegeeda creek (Ashburton River) (Fig. 6, 9 B). This species was previously known by Biologic Environmental Surveys as Parabathynellidae sp. “ Biologic-PBAT 022 ”. N. nguyenae sp. nov. can be distinguished by the combination of characters listed in Supplementary Material Table S 2. It is part of a partially supported clade (Fig. 2) formed by one species collected in the Onslow River Catchment, and four species collected geographically close in the Ashburton River Catchment (N. vanweesae sp. nov., N. hueyi sp. nov., N. mittrai sp. nov., N. rodmani sp. nov.) (Figs. 6, 9 B).	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A9560EFFF7FF790E0EFF7A37D1.taxon	etymology	Etymology. The name of the species is dedicated to a colleague, Kim Nguyen, one of the collectors of this species.	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A95602FFF2FF790B32FE28335D.taxon	description	(Figs. 19, 20, Appendix 7 G) urn: lsid: zoobank. org: act: 2425124 C- 92 EA- 43 E 3 - 9 A 5 E-E 44 B 6 C 6 B 3 F 5 A	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A95602FFF2FF790B32FE28335D.taxon	materials_examined	Material examined. Holotype male. AUSTRALIA: Western Australia: Gudai Darri, Pilbara, bore MB 12 FDT 018 (stygo net haul), 22 ° 31 ' 23.7085 " S, 119 ° 08 ' 39.5088 " E, 18 September 2022, F. Rudin, A. Umbrello (WAMC 82058 - BMR 05158 - BES 17314, permanent slide). Paratype AUSTRALIA: Western Australia: 1 female, Gudai Darri, Pilbara, bore MB 12 FDT 020 (stygo net haul), 22 ° 31 ' 23.7066 " S, 119 ° 8 ' 39.5082 " E, 3 November 2020, F. Rudin, M. Curran (WAM C 82059 - BMR 03371 - BES 8379, permanent slide).	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A95602FFF2FF790B32FE28335D.taxon	diagnosis	Diagnosis. AI seven-segmented. AII seven-segmented. Mandibular palp one-segmented formed by one long article and one seta that does not extend beyond the distal end of the pars incisiva. Distal endite of maxillula with seven claws. Three to five articles on exopod of thoracopods. One internal seta on first article of endopod of ThII to VII. Male thoracopod VIII oval, about 1.5 times as long as wide. Sympod of the uropod with non-homonomous spines, with the most proximal one slightly shorter than others; exopod of the uropod similar in length to endopod, with two distal setae. Furca with few small inner spines and two strong distal ones. It differs from all other species of Nicolenella gen. nov. by the combination of characters listed in Supplementary Material Table S 2. The sequenced specimens differ from all the other New Genus, Billibathynella and Brevisomabathynella species sequenced by COI = 15.5 – 25.7 % and 12 S = 13.9 – 34.9 % (Table 3, Appendix 2,3).	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A95602FFF2FF790B32FE28335D.taxon	description	Description male holotype (WAMC 82058). Body length of 0.8 mm. Body nearly seven times as long as maximum width elongated, almost cylindrical, segments slightly widening and lengthening towards posterior end of body (Appendix 7 G). Antennula (Fig. 19 A): seven-segmented, over two times longer than AII. The first article is the longest, followed by the second, third and seventh articles, the last two similar in length, fourth and sixth articles similar in length and shorter than previous two, fifth article shortest. Sixth and seventh articles respectively with two and three terminal aesthetascs. Antennular setation as in Fig. 19 A. Antenna (Fig. 19 B): seven-segmented; the first two articles are similar in length and very short; third and fifth and sixth articles slightly longer and similar in length, fourth and seventh articles are the longest and about twice the length of the first article. Setal formula of AII: 0 + 0 / 0 + 0 / 1 + 1 / 1 + 1 / 0 + 0 / 0 + 0 / 3 (1). Labrum (Fig. 19 C): flat, free edge with 12 teeth. Paragnaths: absent. Mandible (Fig. 19 D): pars incisiva with four teeth; pars molaris with seven claws, the five distal ones denticulated, and the two most proximal ones joined together; tooth of ventral edge triangular. Mandibular palp with one long article and seta not reaching the distal end of the pars incisiva. Maxillula (Fig. 19 E): proximal endite with four unequal claws; distal endite with seven claws: two apical smooth and five denticulated; three smooth, unequal subterminal setae on the outer distal margin. Maxilla (Fig. 19 F): four-segmented, setal formula 3, 4, 9, 3. Thoracopods I to VII (Figs. 20 A – G): length slightly increasing from thoracopod one to five, thoracopods five and six similar in length, and seven shorter. Epipod present in all thoracopods, about half of the length of the corresponding basipod. All basipods with one distolateral seta shorter than the first article of the endopod. Exopod of ThI and VII shorter than the first three articles of endopod, exopod of ThII and V similar in length to endopod, exopod of ThIII and IV longer than endopod, and exopod of ThVI similar in length to the first three articles of endopod. Exopod of all thoracopods with two very long distal setae on each article. Number of exopodal segments of Ths I to VII 3 - 4 - 4 - 4 / 5 - 4 - 4 - 3. Endopod four-segmented in all thoracopods. First article slightly shorted than article two and three in Th I, and about half as long as the in ThII to VII, second and third article similar in length, and the fourth article small in all thoracopods; first and second articles bearing an outer plumose seta and one smooth inner seta in all thoracopods, except ThI that bears two inner setae; third article with one small outer distal seta on all thoracopods and one inner seta on ThI; fourth article very reduced with two strong claws of different length on all thoracopods and one smooth seta. Setal formula of endopods as follow: ThI 2 + 1 / 2 + 1 / 1 + 1 / 3 (1) ThII to VII 1 + 1 / 1 + 1 / 0 + 1 / 3 (1) Thoracopod VIII (Fig. 19 G, H): compact, longer than wider. Penial region massive. Outer lobe rounded, reaching the distal end of basipod, and not defined at base in latero-external view. Dentate lobe with three teeth. Inner lobe triangular shorter than outer lobe. Basipod sub-square, without setae. Endopod and exopod small with respectively one small seta and two teeth. Pleopod I (Fig. 20 H): one segmented with a long smooth seta. Uropod (Fig. 20 I): sympod more than twice as long as the endopod and four and a half times as long as wide, with eight non-homonomous spines, with the most proximal one slightly shorter than others, occupying about half of the length of the sympod. Endopod similar in length to exopod, with two distal strong spines and two inner small ones, two dorsal plumose setae that exceed the tip of the distal spines and two long distal barbed setae. Exopod with five barded setae, two terminal, two dorsal, and one basiventral seta. Pleotelson (Fig. 20 J): with one small plumose lateral seta on each side; anal operculum not protruded. Furca (Fig. 20 J): rami rectangular, with seven barbed spines, five short proximal ones and two strong and longer distal ones. Two dorsal plumose setae, the inner one short and the outer one reaches beyond the end of the distal spines. Female paratype differs from male in the small cone-shape ThVIII (Fig. 19 I). Variability: variability was observed in body size (male 0.8 and female 1.2 mm), number of teeth on labrum (12 – 14); number of exopodal articles on the thoracopods (3 – 5); number of inner setae on first and second article of ThI endopod (1 – 2); number of spines on sympod of uropod (8 – 10) and number of spines on furcal rami (7 – 8).	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A95602FFF2FF790B32FE28335D.taxon	distribution	Distribution and remarks. N. newtonorum sp. nov. has been collected in two bores near the Gudai-Darri area (Fortescue River) (Fig. 6, 9 C). This species was previously known by Biologic Environmental Surveys as Parabathynellidae sp. “ Biologic-PBAT 020 ”. N. newtonorum sp. nov. can be distinguished by the combination of characters listed in Supplementary Material Table S 2. It is sister to Parabthynellidae sp. 15 (N. sp. 15) that could represent N. cassidis comb. nov. (Fig. 2) collected in the Ethel Gorge, over 100 km southeast of the Gudai-Darri area (Fig. 6).	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A95602FFF2FF790B32FE28335D.taxon	etymology	Etymology. The name of the species is dedicated to the Newton family (Tim, Isaac and Zeno: husband and sons of the principal author).	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A95607FF8FFF790EBEFE953645.taxon	description	(Figs. 21 – 23, Appendix 7 H) urn: lsid: zoobank. org: act: CB 400636 - 7857 - 43 CF- 8 B 26 - 17 E 791 EEC 3 A 3	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A95607FF8FFF790EBEFE953645.taxon	materials_examined	Material examined. Holotype male. AUSTRALIA: Western Australia: Gudai Darri, Pilbara, Bore MR 05 KDDWB 001 (stygo net haul), 22 ° 19 ' 49.8864 " S, 118 ° 39 ' 41.4576 " E, 21 September 2021, F. Rudin, P. Runham (WAMC 82055 - BMR 05147 - BES 13219 A, permanent slide). Paratypes: AUSTRALIA: Western Australia: 1 female, WAM C 79102 - BMR 05145 - BES 17476 B, permanent slide, same details as holotype, but collection date 20 October 2022, F. Rudin, A. Umbrello. 1 female, WAM C 79103 - BMR 03367 - BES 8245, permanent slide, same details as holotype, but collection date 1 November 2020, F. Rudin, M. Curran. 1 specimen (sex not available), WAM C 79104 - BMR 05974 - BES 15836, in ethanol, same details as holotype. 1 male, WAM C 82053 - BMR 05144 - BES 17476 A, in ethanol, same details as WAMC 79102. 1 female, WAMC 82054 - BMR 05146 - BES 8110 permanent slide, same details as holotype, but collection date 19 July 2022, P. Runham, I. Johansson. 1 male, WAMC 82056 - BES 13219, permanent slide, same details as holotype. Additional material: 2 males and 2 females, WAMC 82057 - BES 13219, in ethanol, same details as holotype.	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A95607FF8FFF790EBEFE953645.taxon	diagnosis	Diagnosis. AI seven-segmented. AII five-segmented. Mandibular palp one-segmented formed by one long article and one seta that does not extend beyond the distal end of the pars incisiva. Distal endite of maxillula with five claws. Three or four articles on exopod of thoracopods. One internal seta on first article of endopod of ThII to VII. Male thoracopod VIII sub-rectangular, about 1.5 times as long as wide. Sympod of the uropod with homonomous spines; exopod of the uropod similar in length to endopod, with two distal setae. Furca with few small inner spines and two strong distal ones. It differs from all other species of Nicolenella gen. nov. by the combination of characters listed in Supplementary Material TableS 2. The sequenced specimens differ from all the other Nicolenella gen. nov., Billibathynella and Brevisomabathynella species sequenced by COI = 16.6 – 24.3 % and 12 S = 20.2 – 30 % (Table 3, Appendix 2, 3).	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A95607FF8FFF790EBEFE953645.taxon	description	Description male holotype (WAMC 82055). Body length of 1.05 mm. Body nearly five times as long as maximum width elongated, almost cylindrical, segments slightly widening and lengthening towards posterior end of body (Appendix 7 H). Antennula (Fig. 21 A): seven-segmented, nearly two times longer than AII. The first article is the longest, followed by the second and the third articles, which are similar in length, sixth and seventh articles similar in length and slightly longer than the fourth and fifth ones which are the shortest. Sixth and seventh articles with three terminal aesthetascs. Antennular setation as in Fig. 21 A. Antenna (Fig. 21 B): five-segmented; less than half the length of AI; the first two articles are similar in length and very short; third is double the length of the first, fourth and fifth articles similar in length, and about twice the length of the third article. Setal formula of AII: 0 + 0 / 0 + 0 / 1 + 1 / 1 + 1 / 3 (1). Labrum (Fig. 21 C): flat, free edge with 15 teeth. Paragnaths: absent. Mandible (Fig. 21 D): pars incisiva with four teeth; pars molaris with nine claws, the seven distal ones denticulated, and the two most proximal ones joined together; tooth of ventral edge triangular. Mandibular palp with one long article and seta not reaching the distal end of the pars incisiva. Maxillula (Fig. 21 E): proximal endite with four almost equal claws; distal endite with five claws: three apical and one proximal smooth and one denticulated; two smooth, unequal subterminal setae on the outer distal margin. Maxilla (Fig. 21 F): four-segmented, setal formula 2, 3,8,7. Thoracopods I to VII (Figs. 22 A – E, 23 A, B): length slightly increasing from thoracopod one to four, and similar in length from ThV to VII. Epipod present in all thoracopods, about half of the length of the corresponding basipod. All basipods with one distolateral seta longer than the first article of the endopod in ThI and II, shorter in ThIII to VII. Exopod same length as endopod in ThI, II and VI, longer in ThIII to V, and slightly shorter in ThVII. Exopod of all thoracopods with two very long distal setae on each article. Number of exopodal segments of ThI to VII: 3 - 3 - 3 / 4 - 4 - 4 - 4 - 4. Endopod four-segmented in all thoracopods. First article shorter than article two and three, which are similar in length, and the fourth article small in all thoracopods; first and second articles bearing an outer plumose seta and one smooth inner seta in all thoracopods, except ThVI that has no inner seta on the first article; third article with one outer distal seta on all thoracopods; fourth article very reduced with two strong claws of different length and one smooth seta on all thoracopods. Setal formula of endopods as follow: ThI to V and VII 1 + 1 / 2 + 1 / 0 + 1 / 3 (1) ThVI 0 + 1 / 1 + 1 / 0 + 1 / 3 (1) Thoracopod VIII (Fig. 23 D, E): compact, longer than wider. Penial region with massive protopod. Outer lobe elongated, finger-like, reaching beyond the distal end of basipod, and not defined at base. Dentate lobe with several distal teeth. Inner lobe oval and as long as outer lobe. Basipod without setae, but with a frontal denticulated crest (or projection). Endopod small, similar to exopod, with one long seta. Pleopod I (Fig. 23 C): one segmented with a long smooth seta. Uropod (Fig. 22 F): sympod more than twice as long as the endopod, and nearly four times as long as wide, with eight homonomous spines occupying about half of the length of the sympod. Endopod similar in length to exopod, with two distal strong spines and one inner small one, two dorsal plumose setae that exceed the tip of the distal spines and two long distal barbed setae. Exopod with five barbed setae, two terminal, two dorsal, and one basiventral seta. Pleotelson (Fig. 22 G): with one very short lateral seta on each side; anal operculum not protruded. Furca (Fig. 22 G): rami trapezoidal, with eight barbed spines, six short proximal ones and two strong and longer distal ones. Two dorsal plumose setae, the inner one short and the outer one reaches beyond the end of the distal spines. Female paratype differs from male in the small cone-shape thoracopod VIII (Fig. 23 F, G). Variability: variability was observed in body size (male 1.05 – 1.21 and female 1.03 – 1,08 mm), number of teeth on labrum (14 – 16); number of claws on pars molaris (7 – 9), number of exopodal articles on the thoracopods (3 – 4); number of inner setae on the first and second article of thoracopod endopods, number of spines on sympond of uropod (6 – 8), number of spines on endopod of uropod (3 – 4), number of setae on exopod of uropod (4 – 5) \, and number of spines on furcal rami (7 – 8).	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A95607FF8FFF790EBEFE953645.taxon	distribution	Distribution and remarks. N. isabelleana sp. nov. has been collected in one bore in the middle of the Fortescue River Catchment (Fig. 6). This species was previously known by Biologic Environmental Surveys as Parabathynellidae sp. “ Biologic-PBAT 021 ”. N. isabelleana sp. nov. can be distinguished by the combination of characters listed in Supplementary Material Table S 2. It is part of a well-supported clade formed by Parabathynellidae sp. PBAT 038 (N. sp. PBAT 038) collected about 80 km southeast of N. isabelleana sp. nov. type locality, and N. pilbaraensis comb. nov. (Fig. 2) collected in the Ethel Gorge, about 150 km southeast (Fig. 6).	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A95607FF8FFF790EBEFE953645.taxon	etymology	Etymology. The name of the species is dedicated to a colleague, Isabelle Johansson, one of the collectors of this species.	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A9567AFF8AFF790B86FCFD3331.taxon	description	(Figs. 24, 25, Appendix 7 I) urn: lsid: zoobank. org: act: C 3 BC 66 AE-FD 39 - 4 F 7 D-BA 4 C- 4 AF 4 C 0 D 27 C 4 C	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A9567AFF8AFF790B86FCFD3331.taxon	materials_examined	Material examined. Holotype male. AUSTRALIA: Western Australia: Gudai Darri, Pilbara, Bore MB 12 K 58 W 018 (stygo net haul), 22 ° 32 ' 23.2337 " S, 119 ° 00 ' 32.1872 " E, 12 March 2021, F. Rudin, S. Floeckner (WAMC 82060 - BMR 02725 - BES 10759, permanent slide). Female unknown.	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A9567AFF8AFF790B86FCFD3331.taxon	diagnosis	Diagnosis. AI seven-segmented. AII seven-segmented. Mandibular palp one-segmented formed by one long article and one seta that does not extend beyond the distal end of the pars incisiva. Distal endite of maxillula with seven claws. Four or five articles on exopod of thoracopods. One internal seta on first article of endopod of ThII to VII. Male thoracopod VIII rectangular, about 1.5 times as long as wide. Sympod of the uropod with homonomous spines; exopod of the uropod slightly shorter than endopod, with two distal setae. Furca with few small inner spines and two strong distal ones. It differs from all other species of Nicolenella gen. nov. by the combination of characters listed in Supplementary Material Table S 2. The sequenced specimens differ from all the other Nicolenella gen. nov., Billibathynella and Brevisomabathynella species sequenced by COI = 18.2 – 25.4 % and 12 S = 21.3 – 31.4 % (Table 3, Appendix 2,3).	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A9567AFF8AFF790B86FCFD3331.taxon	description	Description male holotype (WAMC 82060). Body length of 1.48 mm. Body over five and a half times as long as maximum width, elongated, almost cylindrical, segments slightly widening and lengthening towards posterior end of body (Appendix 7 I). Antennula (Fig. 24 A): seven-segmented, two times longer than AII. The first article is the longest, followed by the sixth, second and third similar in length and slightly longer than the fourth, fifth and seventh, which are similar in length and the shortest. Sixth and seventh articles respectively with two and three terminal aesthetascs. Antennular setation as in Fig. 24 A. Antenna (Fig. 24 B): seven-segmented; the first two articles are similar in length and shortest; third, sixth and fifth similar in length and slightly shorter that article four, seventh segment is the longest and double article sixth. Setal formula of AII: 0 + 0 / 0 + 0 / 1 + 1 / 1 + 1 / 0 + 0 / 1 + 0 / 4 (1). Labrum (Fig. 24 C): flat, free edge with 20 teeth. Paragnaths: absent. Mandible (Fig. 24 D): pars incisiva with five teeth; pars molaris with eight claws, the six distal ones denticulated, and the two most proximal ones joined together; tooth of ventral edge triangular. Mandibular palp with one long article and seta not reaching the distal end of the pars incisiva. Maxillula (Fig. 24 E, F): proximal endite with four unequal claws; distal endite with seven claws: two apical one smooth and the rest denticulated; three smooth, unequal subterminal setae on the outer distal margin. Maxilla (Fig. 24 G): four-segmented, setal formula 4, 4,13,1. Thoracopods I to VII (Figs. 25 A – G): length slightly increasing from thoracopod one to six, last two thoracopods similar in length. Epipod present in all thoracopods, about half or as more than half the length of the corresponding basipod. All basipods with one distolateral seta shorter than the first article of the endopod. Exopod of ThI and VII shorter than the first three articles of the endopod, exopod of ThII as long as the first three articles of endopod, and exopod of ThIII to V as long as endopod. Exopod of ThVI broken. Exopod of all thoracopods with two very long distal setae on each article. Number of exopodal segments of Ths I to VII: 4 - 5 - 5 - 5 - 5 - 3 + - 4. Endopod four-segmented in all thoracopods. First article shorter than article two and three, which are similar in length, and fourth article small in all thoracopods; first and second articles bearing an outer plumose seta, one smooth inner seta on article one and three smooth setae on article two in all thoracopods, except ThI that has three inner setae on the first article and ThVII that has two inner setae on the second article; third article with one outer distal seta on all thoracopods, and one inner seta on ThI; fourth article very reduced with two strong claws of different length and two smooth seta on all thoracopods. Setal formula of endopods as follow: ThI 3 + 1 / 3 + 1 / 1 + 1 / 4 (2) ThII to VI 1 + 1 / 3 + 1 / 0 + 1 / 4 (2) ThVII 1 + 1 / 2 + 1 / 0 + 1 / 4 (2) Thoracopod VIII (Fig. 24 H, I): compact, longer than wider. Penial region with massive protopod. Outer lobe rounded, reaching beyond the distal end of basipod, and not defined at base. Dentate lobe with four teeth. Inner lobe rounded slightly shorter than outer lobe. Basipod with a frontal crest (or projection), without setae. Endopod small with two setae, and exopod with a small distal lump and no setae. Pleopod I (Fig. 25 H): one segmented with a short plumose seta. Uropod (Fig. 25 I): sympod one and a half times longer than endopod, and over three times as long as wide, with eight / nine (left and right) homonomous spines occupying about half of the length of the sympod. Endopod slightly longer than exopod, with two distal strong spines and three inner small one, two dorsal plumose setae that exceed the tip of the endopod and two long distal barbed setae. Exopod with six barbed setae, two terminal, three dorsal, and one basiventral seta. Pleotelson (Fig. 25 J): with one short lateral seta on each side; anal operculum not protruded. Furca (Fig. 25 J): rami rectangular, with 11 barbed spines, nine short proximal ones and two long and strong distal ones. Two dorsal plumose setae, the inner one short and the outer one reaches beyond the end of the distal spines. The female of this species is unknown.	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A9567AFF8AFF790B86FCFD3331.taxon	distribution	Distribution and remarks. N. floecknerae sp. nov. has been collected in one bore at the Gudai-Darri area, in the Fortescue River Catchment (Fig. 9 C). This species was previously known by Biologic Environmental Surveys as Parabathynellidae sp. “ Biologic-PBAT 024 ”. N. floecknerae sp. nov. can be distinguished by the combination of characters listed in Supplementary material Table S 2. It is sister to Parabthynellidae sp. 18 (N. sp. 18) collected about 80 km southeast in the Fortescue River Catchment, and it is also genetically close to N. abramsae sp. nov., collected about 170 km north in the DeGrey River Catchment (Fig. 6).	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A9567AFF8AFF790B86FCFD3331.taxon	etymology	Etymology. The name of the species is dedicated to one of the collectors, Stephanie Floeckner, colleague who also has extensively worked on the genetics of Parabathynellidae.	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A9567FFF86FF790E92FDBF37D1.taxon	description	(Figs. 26, 27, Appendix 7 J) urn: lsid: zoobank. org: act: EF 09 ECF 5 - 037 C- 485 D-AB 54 - E 1 E 96 D 213293	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A9567FFF86FF790E92FDBF37D1.taxon	materials_examined	Material examined. Holotype male. AUSTRALIA: Western Australia: Gudai Darri, Pilbara, Bore MB 19 K 58 W 0001 (stygo net haul), 22 ° 31 ' 52.1868 " S, 119 ° 00 ' 20.0779 " E, 19 September 2022, F. Rudin, A. Umbrello (WAMC 82062 - BMR 05159 - BES 17166, permanent slide). Paratypes: 1 juvenile, WAMC 82061 - BMR 03368 - BES 10302 in ethanol, same detail as holotype, but collection date 2 November 2020, F. Rudin, M. Curran. 1 juvenile WAMC 82063 - BMR 02728 - BES 8318 in ethanol, same detail as holotype, but collection date 11 March 2021, P. Runham, S. Floeckner.	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A9567FFF86FF790E92FDBF37D1.taxon	diagnosis	Diagnosis. AI seven-segmented. AII six / seven-segmented, partial separation between article six and seven. Mandibular palp one-segmented formed by one long article and one seta that does not extend beyond the distal end of the pars incisiva. Distal endite of maxillula with six claws. Three to five articles on exopod of thoracopods. One internal seta on first article of endopod of ThII to VII. Male thoracopod VIII rectangular, about 1.5 times as long as wide. Sympod of the uropod with homonomous spines; exopod of the uropod slightly shorter than endopod, with three distal setae, two dorsal and one basiventral seta. Furca with few small inner spines and two strong distal ones. It differs from all other species of Nicolenella gen. nov. by the combination of characters listed in Supplementary Material TableS 2. The sequenced specimens differ from all the other Nicolenella gen. nov., Billibathynella and Brevisomabathynella species sequenced by COI = 17.2 – 25.8 % and 12 S = 21.7 – 31.3 % (Table 3, Appendix 2,3).	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A9567FFF86FF790E92FDBF37D1.taxon	description	Description male holotype (WAMC 82062). Body length of 1.2 mm. Body over five times as long as maximum width, elongated, almost cylindrical, segments slightly widening and lengthening towards posterior end of body (Appendix 7 J). Antennula (Fig. 26 A): seven-segmented, over two times longer than AII. The first article is the longest, followed by the second and third, which are similar in length and slightly longer than article sixth and seventh; fourth article slightly longer than article five, which is the shortest. Fifth article with two, and sixth and seventh articles with three terminal aesthetascs. Antennular setation as in Fig. 1 A. Antenna (Fig. 26 B): seven-segmented; the first article is the shortest; second and third article short and similar in length, sixth and fifth similar in length and slightly shorter than article four and seven, which are the longest and similar in length. Separation between article six and seven not complete. Setal formula of AII: 0 + 0 / 0 + 0 / 1 + 1 / 1 + 1 / 0 + 0 / 1 + 0 / 4 (1). Labrum (Fig. 26 C): concave, free edge with 17 teeth. Paragnaths: absent. Mandible (Fig. 26 D): pars incisiva with four teeth; pars molaris with seven claws, the five distal ones denticulated, and the two most proximal ones joined together; tooth of ventral edge triangular. Mandibular palp with one long article and seta not reaching the distal end of the pars incisiva. Maxillula (Fig. 26 E): proximal endite with four unequal claws; distal endite with six claws: two apical one smooth and the rest denticulated; three smooth, unequal subterminal setae on the outer distal margin. Maxilla (Fig. 26 F): four-segmented, setal formula 3, 4, 9, 4. Thoracopods I to VII (Figs. 27 A – G): length slightly increasing from thoracopod one to five, last two thoracopods shorter and similar in length. Epipod present in all thoracopods, about half or more than half length of the corresponding basipod. All basipods with one distolateral seta shorter than the first article of the endopod. Exopod slightly longer than the first two articles of the endopod in thoracopod I, exopod of ThII and VII slightly shorter than endopod, exopod of ThIII and VI as long as endopod, and exopod of ThIV and V slightly longer than endopod. Exopod of all thoracopods with two very long distal setae on each article. Number of exopodal segments of Ths I to VII: 3 - 4 - 4 - 4 - 4 / 5 - 4 - 4. Endopod four-segmented in all thoracopods. First article shorter than article two and three, which are similar in length, and fourth article small in all thoracopods; first and second article bearing an outer plumose seta, one smooth inner seta on article one and two smooth setae on article two in all thoracopods, except ThI that has two inner setae on the first article and three on the second one, and ThVII that has one inner seta on the second article on one side; third article with one outer distal seta on all thoracopods, and one inner seta on ThI; fourth article very reduced with two strong claws of different length and two smooth seta on ThI to IV (but one side of ThIV has only one seta), and two claws and one seta on ThV to VII. Setal formula of endopods as follow: ThI 2 + 1 / 3 + 1 / 1 + 1 / 4 (2) ThII, III 1 + 1 / 2 + 1 / 0 + 1 / 4 (2) ThIV 1 + 1 / 2 + 1 / 0 + 1 / 3 (1) and 4 (2) ThV, VI 1 + 1 / 2 + 1 / 0 + 1 / 3 (1) ThVII 1 + 1 / 1,2 + 1 / 0,1 + 1 / 3 (1) Thoracopod VIII (Fig. 26 G, H): compact, longer than wider. Penial region with massive protopod. Outer lobe curved, reaching over the distal end of basipod. Inner lobe small, shorter than outer lobe. Basipod with frontal crest (or projection) and without setae. Exopod very small without setae, endopod slightly bigger with one seta. Pleopod I (Fig. 27 H): one segmented with a long plumose seta. Uropod (Fig. 27 I): sympod two times longer than endopod, and three and a half times as long as wide, with eight homonomous spines occupying about half of the length of the sympod. Endopod slightly longer than exopod, with two distal strong spines and one or two inner small spines, two dorsal plumose setae that exceed the tip of the endopod and two long distal barbed setae. Exopod with six barbed setae, two terminal, three dorsal, and one basiventral seta. Pleotelson (Fig. 27 J): with one short lateral seta on each side; anal operculum not protruded. Furca (Fig. 27 J): rami rectangular, with eight barbed spines, six short proximal ones and two long and strong distal ones. Two dorsal plumose setae, the inner one short and the outer one twice as long as the distal spine. The female of this species is unknown.	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A9567FFF86FF790E92FDBF37D1.taxon	distribution	Distribution and remarks. N. morganae sp. nov. has been collected in two bores at the Gudai-Darri area, in the Fortescue River Catchment (Fig. 6, 9 C). This species was previously known by Biologic Environmental Surveys as Parabathynellidae sp. “ Biologic-PBAT 053 ”. N. morganae sp. nov. can be distinguished by the combination of characters listed in Supplementary Material Table S 2. It is sister to Parabthynellidae Lineage C (N. sp. Marillana) (Fig. 2) collected about 20 km south in the Fortescue River Catchment (Fig. 6).	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
310187A9567FFF86FF790E92FDBF37D1.taxon	etymology	Etymology. The name of the species is dedicated to a colleague, Liesel Morgan, who has extensively worked on the genetics of Parabathynellidae.	en	Perina, Giulia, Camacho, Ana I., Morgan, Liesel, Floeckner, Stephanie, Guzik, Michelle T. (2025): Morphological and molecular description of ten new species of a new genus of Parabathynellidae (Bathynellacea, Crustacea) from the Pilbara region, Western Australia. Zootaxa 5712 (1): 1-103, DOI: 10.11646/zootaxa.5712.1.1, URL: https://doi.org/10.11646/zootaxa.5712.1.1
