taxonID	type	description	language	source
03D8C423FF97FFF1FF7709D4E467FB2E.taxon	diagnosis	Generic diagnosis. Microlaimidae. Cephalic sensilla longer or approximately equal with outer labial sensilla. Amphid monospiral, rounded. Somatic setae never situated on processes. Cuticle annulated or optically smooth, without thorns. Shape of oesophagial bulb varying from spherical to pyrifom. Testis single, directed anterior, outstretched. Gubernaculum capable bearing apophysis. Ovaries outstretched. Tail conical or elongated.	en	Miljutin, Dmitry M., Miljutina, Maria A. (2009): Deep-sea nematodes of the family Microlaimidae from the Clarion-Clipperton Fracture Zone (North-Eastern Tropic Pacific), with the descriptions of three new species *. Zootaxa 2096 (1): 137-172, DOI: 10.11646/zootaxa.2096.1.11, URL: https://biotaxa.org/Zootaxa/article/view/zootaxa.2096.1.11
03D8C423FF97FFFAFF770F0CE764FDA6.taxon	description	(Figs 2 – 4, Table 2) Type material: Collection number MNHN-BN 490. Holotype: one male. Paratype: one female. Locality: Tables 1, 2. Etymology: In honor of Dr. Prof. Pedro Martínez Arbizu (German Centre for Marine Biodiversity Research (DZMB), Wilhelmshaven, Germany). Measurements: Table 2. Description of male: Very small nematode. Body cylindrical, with slightly narrowed anterior end and conical tail. Cuticle annulated along whole body except cephalic capsule. Cuticular annuli strongly pronounced, each about 1 µm width. Cuticle thickness approximately 0.3 µm at level of cephalic capsule and approximately 1 µm at rest body. Somatic setae not found. Sensilla of cephalic end arranged in 2 rings spaced far apart: 6 very short (0.4 µm) outer labial setae at level of cephalic tip and 4 submedian cephalic setae (0.6 µm) near posterior border of cephalic capsule. Amphid monospiral, round, with fine but distinct sclerotized margins, approximately 1 / 2 of c. b. d. in its diameter. There are 10 cuticular annules between anterior rim of amphid and cephalic capsule. Buccal cavity narrow, distinguished from rest, posterior pharynx by its thicker cuticular walls of its internal lumen. One small dorsal sclerotized tooth visible at its medium part. Pharynx cylindrical but possessnig a well-developed terminal oval bulb approximately 75 % of c. b. d. in its width. Single pair of plasmatic inclusions visible on optical transversal section at level of middle of pharyngeal bulb. Nerve ring at a distance 2 / 3 – 3 / 4 of pharyngeal length from anterior end. Cellular body of renetta located at level of beginning of intestine. Cardia large, triangular, approximately 1 / 2 of c. b. d. in its width. Reproductive system monorchic, with single outstretched testis lying to the left of intestine. Testis gradually widening to vas deferens without forming morphologically distinct border. Large nuclei of spermatids visible in latter. Spicules long and thin, curved, with feebly marked knob at its distal end. Gubernaculum in shape of a curved, thin rod. Distal end of gubernaculum directed anteriorly, and possessing a long, curved apophysis of similar thickness, distal end of which being directed dorsally. Supplementary organs not visible. Whole reproductive system occupies approximately 45 % of total body length. Tail conical. Three cellular bodies of caudal glands located close to anus. Outlet of caudal glands visible in caudal tip. Female: Females very similar to males in most parameters, however amphids being smaller (44 % of c. b. d.). Reproductive system very short, didelphic, amphidelphic, with outstretched ovaries. Whole reproductive system occupying approximately 30 % of total body length. Posterior branch of reproductive system 2.5 times longer than anterior one. There are no morphologically distinct borders between ovaries, oviducts and uterus. Most of uterus also located in posterior branch. One big, long oocyte (35 x 9 µm) visible in uterus. One oval spermatozoon 13 x 6 µm in size situated in uterus opposite vulva. Intestine pushed to dorsal side by short anterior ovary, whereas longer posterior one lying to the left of intestine. Every ovary containing one mature elongated oocyte. No vulvar glands seen. Abundance: The density of this species did not exceed 1 ind / 10 cm 2 and relative abundance within the nematode community was about 1 % at the stations where it was found. Differential diagnosis: There are 7 valid species of Aponema at present (Kovalyev & Miljutina 2008). A. martinezi sp. n. differs from most Aponema species by possessing non-set-off head and amphids located quite a far from the non-annulated cephalic capsule (there are 10 cuticular annules between anterior rim of amphid and cephalic capsule). Only two species possess these features: A. minutissima Kovalyov et Miljutina, 2008 and A. nanum (Blome, 1982) (see Kovalyev & Miljutina 2008). The new species also bears the cephalic sensilla of two rings of about the same length, like A. minutissima, and their total body length are similar (260 – 270 µm in A. martinezi sp. n. vs. 209 – 424 µm A. minutissima). However, A. martinezi sp. n. differs from these two species by possessing a gubernaculum with apophysis, whereas apophyses have been not detected in A. minutissima and A. nanum.	en	Miljutin, Dmitry M., Miljutina, Maria A. (2009): Deep-sea nematodes of the family Microlaimidae from the Clarion-Clipperton Fracture Zone (North-Eastern Tropic Pacific), with the descriptions of three new species *. Zootaxa 2096 (1): 137-172, DOI: 10.11646/zootaxa.2096.1.11, URL: https://biotaxa.org/Zootaxa/article/view/zootaxa.2096.1.11
03D8C423FF9CFFFAFF770884E182FCD3.taxon	diagnosis	Generic diagnosis. Microlaimidae. Outer labial setae longer than cephalic setae. Cuticle annulated, each annulus with numeruos fine longitudinal bars. Amphid monospiral, rounded. Testes paired, opposed, outstretched. Ovaries paired, outstretched. Caudal glands possessing a common terminal outlet.	en	Miljutin, Dmitry M., Miljutina, Maria A. (2009): Deep-sea nematodes of the family Microlaimidae from the Clarion-Clipperton Fracture Zone (North-Eastern Tropic Pacific), with the descriptions of three new species *. Zootaxa 2096 (1): 137-172, DOI: 10.11646/zootaxa.2096.1.11, URL: https://biotaxa.org/Zootaxa/article/view/zootaxa.2096.1.11
03D8C423FF9CFFFFFF770989E6CCF84B.taxon	description	(Figs 5 – 8, Table 3) Material examined: 5 males and 2 females (Table 3). Locality: Tables 1, 3. Measurements: Table 3. Description of male: Body cylindrical, with slightly narrowed anterior end and conical tail. Cuticle annulated along whole body except at anteriormost cephalic capsule. Cephalic capsule short, its length less than its width. Cuticular annuli strongly pronounced, each approximately 1.7 µm in width, with very close and fine longitudinal bars. There are distinctly bordered deep furrows between annuli. Cuticle thickness approximately 0.7 µm at level of cephalic capsule and approximately 1 µm at rest body. Cuticle thickness being equal both under annuli and under furrows between annuli. Somatic setae not found. Sensilla of cephalic end arranged in 3 rings spaced from each other: 6 very short papilloid inner labial sensilla approximately 0.3 µm long at level of cephalic tip, 6 outer labial setae approximately 1.3 µm at level of middle of cephalic capsula, and 4 submedian cephalic setae approximately 0.5 µm long near posterior border of cephalic capsule. Amphid monospiral, round, 58 – 70 % c. b. d. in diameter. Anterior half of amphid situated on cephalic capsule, whereas posterior one lying at annulated zone of body under the cuticle. Small pore visible behind amphid. Vestibulum possessing 12 slight ribs. Cuticular walls of pharyngeal internal lumen of stegostoma looking thicker than in other, more posteror part of pharynx. Length of whole stoma approximately 4 µm. Two long dorsal teeth and two short ventral teeth visible in anterior part of stegostoma. Pharynx cylindrical but having a terminal oval bulb 68 – 85 % of c. b. d. in width. Thin radial plasmatic interruptions visible in bulb. Anterior part of pharynx bearing stoma bordered from posterior part by plasmatic interruptions. Nerve ring at a middle of pharynx. Cardia cylindrical, approximately 1 / 3 of c. b. d. in width. Both testes lying ventrally from intestine. Two zones of spermatogenesis visible in anterior testes: small roundish spermatogonia with fine-graned content, large oval spermatogonia with fibrillar content. Largest spermatogonium 10 x 40 µm in size. A single large intracellular structure resembling long meandering coniferous branch with needles visible in each of mostly matured spermatogonia. Vas deferens thick, approximately 1 / 3 of total body length, filled with puck-shaped spermatids approximately 6 µm in diameter with large-grained content. Spicules strongly curved, thick, with complex proximal knob and velum. There is also longitudinal rib at distal half of spicule. Gubernaculum in shape of a curved, thin rod. Supplementary organs not found. Length of whole reproductive system occupying about a half of total body length. Tail conical. Tail of all examined specimens being S-shaped. Female: Females very similar to males in most parameters, except their pharyngeal bulbus being smaller relative to c. b. d. (50 – 67 %). Reproductive system short, didelphic, amphidelphic, with outstretched ovaries. Anterior ovary lying to the right of intestine, posterior one lying to the left of intestine. There are no morphologically distinct borders between ovaries, oviducts and uterus. Whole reproductive system occupying approximately 30 % of total body length. Size of mature oocyte 16 x 38 µm. Spermatozoa not found. Vulvar glands present. Both females possessing shelters consisting of some mucus covered with small inorganic particles. Abundance: The density of this species was 0.6 – 1.6 inds / 10 cm 2 and relative abundance within nematode community was 1 – 2 % at the stations where it was found. Remarks: C. mirabilis was initially described by Bussau and Vopel (1999) from the abyssal eastern tropical South Pacific (Peru Basin), which is located about 5200 km from the area we report them from. The specimens from the new area resemble those described by Bussau and Vopel (1999) very well. There are several insignificant distinctions only. The maximum body length of new specimens is slightly more than in specimens of type series (483 µm vs. 450 µm respectively); body is thinner (a = 17.5 – 24.3 vs. 12.6 – 18.0), tail is shorter (c = 6.5 – 7.9 vs. 5.1 – 6.4). The ring of labial papillae was not described in the original description, whereas this ring, consisting of 6 papilloid sensilla, was found in new specimens. Several somatic setae were found in type specimens, whereas they were not visible in new individuals. However, such distinctions are insufficient for assigning new species and may be explained by intraspecific variation and by difference in methods of treatment (new specimens were preserved in alcohol, whereas type specimens were kept in formaldehyde). The characteristic number of teeth in the stegostoma is three for the genus Microlaimus. However, four teeth were found in the buccal cavity of C. mirabilis both in the Bussau’s and Vopel’s (1999) original description and in the present work. So, the presence of four teeth cannot be considered an error. It may be due to a secondary division of the initially single dorsal tooth. Intracellular structures resembling long winding non-ramifying coniferous branch with needles visible in each of mostly matured spermatids are probably major sperm proteins (MSP). This unique cytoskeleton was found only in nematodes and only in male germ cells (Justine 2002).	en	Miljutin, Dmitry M., Miljutina, Maria A. (2009): Deep-sea nematodes of the family Microlaimidae from the Clarion-Clipperton Fracture Zone (North-Eastern Tropic Pacific), with the descriptions of three new species *. Zootaxa 2096 (1): 137-172, DOI: 10.11646/zootaxa.2096.1.11, URL: https://biotaxa.org/Zootaxa/article/view/zootaxa.2096.1.11
03D8C423FF9AFFFCFF770A82E682FE4A.taxon	diagnosis	Generic diagnosis: Microlaimidae. Stoma with dorsal and pair of subventral teeth, without numerous subventral denticles. Cephalic sensilla longer or approximately equal to outer labial sensilla and being more than 1 / 3 of c. b. d. distance from latter. Cuticle usually annulated, rarely optically smooth. Amphid usually monospiral and rounded, rarely with several turns. Testes usually paired, opposed, outstretched. Ovaries paired, outstretched. Caudal glands possessing a common terminal outlet.	en	Miljutin, Dmitry M., Miljutina, Maria A. (2009): Deep-sea nematodes of the family Microlaimidae from the Clarion-Clipperton Fracture Zone (North-Eastern Tropic Pacific), with the descriptions of three new species *. Zootaxa 2096 (1): 137-172, DOI: 10.11646/zootaxa.2096.1.11, URL: https://biotaxa.org/Zootaxa/article/view/zootaxa.2096.1.11
03D8C423FF9AFFE6FF770820E19AFD13.taxon	description	(Figs 9 – 12, Table 4) Type material: Collection number MNHN-BN 491. Holotype: one male. Paratype: 5 males, 4 females (Table 4). Locality: Tables 1, 4. Etymology: Greek abyssos (= precipice, abyss). Measurements: Table 4. Description of male: Body cylindrical, with slightly narrowed anterior end and conical tail. Cuticle annulated along whole body except cephalic capsule. Cuticular annuli approximately 1 µm in width. Cuticle thickness approximately 0.6 µm at level of cephalic capsule, 0.8 µm at level of midbody and approximately 0.7 µm at level of tail. Holotype possessing two small somatic setae 1.5 – 2.0 µm long at pharyngeal part of the body between amphid and nerve ring. Cephalic end of holotype male was hard to discern, so the main characteristics of the apical end were described using paratypes. Paratype possessing 1 circle of 4 minute cephalic setae of approximately 1 µm length. Amphid monospiral, round, distinct cuticular edging, 58 % (46 – 58 %) of c. b. d. in its diameter. In holotype, there are 15 (15 – 17 in paratypes) cuticular annules between anterior end of amphid and cephalic capsule. Buccal cavity present, its cuticular walls looking thicker than in more posterior part of pharynx. Three small sclerotized teeth visible in anterior part of buccal cavity (one bigger dorsal one and two smaller subventral ones). Pharynx consisting of slender cylindrical anterior part with well developed muscular elements and posterior terminal muscular bulb with plasmatic interruptions. Bulb rhomboid with rounded corners or oval, 74 % (74 – 95 %) of c. b. d. in width with several plasmatic interruptions. Length of bulb 19 (16 – 19) µm. Nerve ring at a distance 2 / 3 of pharyngeal length from anterior end. Cellular body of renetta located at level of beginning of intestine. Cardia large, triangular, 43 % of c. b. d. in its width. Holotype possesses plasmatic interruptions in cardia. Reproductive system diorchic, with outstretched anterior testis, and reflected posterior one. Anterior testis lies to the left of intestine. Posterior testis shorter than anterior one and lying to the right of intestine. Vas deferens thick, 36 % of total body length, filled with big spermatids of approximately 9 µm in diameter with coarse-grained content. Spicules rather large, curved, with feebly developed capitulum at its distal end and thin velum. Gubernaculum in shape of a curved, thick rod. Thick prominent bent, hook-like apophysis present which liyng perpendicularly to gubernaculum to caudal direction in its basal part and than changing to be dorsal. Supplementary organs not visible. Whole reproductive system occupying 52 % of total body length. Tail conical. Caudal glands of holotype not visible. Paratypes possess three cellular bodies of caudal glands located close to anus. Outlet of caudal glands visible in caudal tip. Female: Females very similar to males in most parameters, however amphids being smaller, 36 – 38 % of c. b. d. Reproductive system didelphic, with outstretched ovaries. Oocytes large, with granular cytoplasm. Anterior ovary lying to the right of intestine, posterior one lying to the left of intestine. Every ovary containing one mature elongated oocyte. Whole reproductive system occupying 29 % of total body length. Several oval or roundish spermatozoa approximately 21 x 42 µm in size situated in uterus. Small part of dorsal wall of uterus located opposite vulva being thicker and strongly sclerotized. Middle part of uterus opposite vulva narrow. No vulvar glands seen. Abundance: The density of this species was 1.0 – 3.4 inds / 10 cm 2 and relative abundance within the nematode community was 1 – 2 % at the stations where it was found. Differential diagnosis: M. abyssalis sp. n. is characterized by presence of large hook-like apophysis directed perpendicularly to gubernaculum in caudal direction in its basal part and than turning to dorsal direction. The presence of apophysis perpendicular to gubernaculum is a rare feature within Microlaimus species. Only M. crassiceps Gerlach, 1953, M. undulatus Gerlach, 1953, M. decraemerae (Muthumbi et Vinx, 1999), and M. mnazi (Muthumbi et Vinx, 1999) possess similar apophyses. [M. decraemerae and M. mnazi were transferred from Aponema to Microlaimus because of the presence of 2 testes in these species (Kovalyov and Miljutina 2008)]. M. abyssalis sp. n. may be distinguished from M. crassiceps and M. undulatus in several features. In the new species cephalic setae are very short, and outer labial setae are not visible, whereas cephalic setae of M. crassiceps and M. undulatus are quite long, and outer labial setae are discernible. The amphids in the new species are located far from the cephalic end (about in 2 amphidial c. b. d.), 15 – 17 annuli are present between the anterior rim of amphids and the posterior border of non-annulated cephalic capsule. The amphids of M. crassiceps are located at a level of cephalic setae, at the posterior half of the cephalic capsule. The amphids of M. undulatus are located close to the cephalic capsule (only 1 annule is between the amphidial anterior rim and the posterior border of cephalic capsule). Besides these features, the body length of M. abyssalis sp. n. is half the body length of M. crassiceps (427 – 568 µm vs. 1095 – 11120 µm). M. abyssalis sp. n. differs from M. mnazi by being longer (427 – 568 µm vs. 253 – 328 µm in M. mnazi); by shorter pharyngeal region (b = 5.0 – 5.9 vs. 4.0 – 4.7); by the shape of spicules (possessing distinct round capitulum it their distal end vs. edged distal end of spicula); by absence of supplemental precloacal organs (whereas M. mnazi possess 1 easily discernible one). M. abyssalis sp. n. most resembles M. decraemerae. However the new species differs from M. decraemerae by its body length (427 – 568 µm vs. 296 – 378 µm in M. decraemerae); by shorter tail (c = 6.5 – 7.3 vs. 5.1 – 6.0). The main difference is in the proportions and the shape of gubernaculum and apophysis: the length of the gubernaculum and the apophysis is approximately equal in the new species, whereas, in M. decraemerae, the apophysis is twice as long as the gubernaculum. The distal end of the apophysis is rounded in the new species in spite of the apophysis of M. decraemerae possessing an edged distal end.	en	Miljutin, Dmitry M., Miljutina, Maria A. (2009): Deep-sea nematodes of the family Microlaimidae from the Clarion-Clipperton Fracture Zone (North-Eastern Tropic Pacific), with the descriptions of three new species *. Zootaxa 2096 (1): 137-172, DOI: 10.11646/zootaxa.2096.1.11, URL: https://biotaxa.org/Zootaxa/article/view/zootaxa.2096.1.11
03D8C423FF80FFEAFF7708C9E07AF8CF.taxon	description	(Figs 13 – 16, Table 5) Material examined: 1 male, 3 females (Table 5) Locality: Tables 1, 5. Measurements: Table 5. Description of male: Body cylindrical, with slightly narrowed anterior end and conical tail. Cuticle annulated. Annuli beginning posterior to cephalic capsule (width of every annulus 1.2 µm). Cuticle thickness 0.9 µm at level of cephalic capsula, and 1.2 µm at rest body. Four submedian rows of short cylindrical tubes 1 µm long and 1 – 1.5 µm in their diameter with pores on its tips situated along whole body. Almost every pore associated with large hypodermal gland 4 – 8 µm in diameter. The number of tubes in dorsolateral rows 3.5 times more than in ventrolateral ones. The content of glands depending on their size. Smaller glands containing fine-grained content, whereas content of bigger glands being coarse-grained. The anteriormost group of 4 tubes situated at the level of posterior rim of amphidial fovea. The posteriormost tube of dorsolateral rows situated at middle of tail; posteriormost tube of ventrolateral rows located behind anus. Location of tubes in rows not absolutely regular, e. g. distance between tubes varying. Tubes of ventrolateral rows situated more sparsely at region of midbody. Four somatic setae of 3 µm length visible at caudal region. No other somatic setae found. Head sensilla arranged in three circles: 6 inner labial papillae 2 µm long of first ring; 6 thick outer labial setae 6 µm long of second one; 4 cephalic setae 6 µm long of third circle situated near posterior border of cephalic capsule. Amphidial fovea monospiral, round, 59 % of c. b. d. in diameter. The amphidial aperture less in diameter than subcuticular amphidial fovea. There are 4.5 cuticular annules between anterior rim of amphid and cephalic capsule. Vestibulum short, bowl-shaped, possessing 12 cuticularized ribs. One big dorsal sclerotized tooth visible in stegostoma. Pharynx thick, muscular, its anterior part at level of stoma slightly set off from its more posterior part. Well-developed terminal pear-shaped bulb about 1 / 3 of c. b. d. in its width present. Nerve ring not found. Renetta with large cellular body located at level of beginning of intestine. Its outlet opening not visible. Cardia short. Reproductive system diorchic, with opposite outstretched testes. Posterior testis shorter then anterior one. The anterior one lies to the right of intestine, and posterior one lies to the left. Vas deferens thick, 26 % of total body length, filled with spermatids with coarse-grained content. Spicules rather large and curved. Gubernaculum rod-like. Supplementary organs not found. Whole reproductive system occupying approximately 1 / 2 of total body length. Tail conical, with protruded tip. Caudal gland not found. Female: Females resembling male but differing in some parameters, such as their amphids being smaller (41 – 44 % of c. b. d.). There are 6 cuticular annules between anterior rim of amphid and cephalic capsule of all female individuals. Posteriormost pore of ventrolateral rows situated before anus. Number of pores in rows varying in different specimens from 35 to 40 in dorsolateral rows and from 9 to 13 in ventrolateral rows. Number of pores in dorsolateral rows in 2.6 – 4.0 times more than in ventrolateral ones. There are only a few pores associated with hypodermal glands. Glands being bigger then males ones (up to 2 / 3 of c. b. d. in its diameter) and possessing more coarse-grained content. Somatic setae not found. Reproductive system didelphic, amphidelphic, with outstretched ovaries, occupying 2 / 5 of total body length. Anterior ovary lying to the left of intestine and posterior one lying to the right. Posterior ovary containing one mature elongated oocyte 69 µm long. Spermatozoa 3 x 12 µm in size visible in uterus. Vulvar glands not visible. Abundance: The average density of this species was 0.03 inds / 10 cm 2. The relative abundance of this species within the nematode community was 1 – 2 % at the stations where it was found. Remarks: This species was initially found in the Peru Basin (the South Pacific), at a depth of 4100 – 4200 m, in ooze containing nodules (cauliflower type nodules) (Bussau & Vopel 1999). Our find is the second record of M. discolensis. The place of new finding locates about 5200 km NM far from the place where the type specimens were found. Environments of the CCFZ are similar to that in the Peru Basin, but the depth of the new finding was about 1 km deeper. Two of our individuals were found in sediment with nodules and two other in the area adjacent to nodule field. The new specimens fit very well the original description as no strong differences were found.	en	Miljutin, Dmitry M., Miljutina, Maria A. (2009): Deep-sea nematodes of the family Microlaimidae from the Clarion-Clipperton Fracture Zone (North-Eastern Tropic Pacific), with the descriptions of three new species *. Zootaxa 2096 (1): 137-172, DOI: 10.11646/zootaxa.2096.1.11, URL: https://biotaxa.org/Zootaxa/article/view/zootaxa.2096.1.11
03D8C423FF8EFFEDFF770A82E682FF49.taxon	description	(Figs 17 – 19, Table 6) Type material: Collection number MNHN-BN 492. Holotype: one male. Paratype: 4 males, 3 females (Table 6). Locality: Tables 1, 6. Etymology: From Latin parvus (scanty, hidden) and porus (pore). Measurements: Table 6. Description of males: Body cylindrical, with slightly narrowed anterior end and conical tail. Cuticle with strongly pronounced annuli, which beginning at posterior of cephalic capsule (width of every annulus 1.1 – 1.3 µm). Cuticle thickness 0.3 µm at level of cephalic capsula and 0.6 – 0.7 µm along rest of body. Four submedian rows of round pores 0.5 µm in diameter situated along whole body. Number of pores in dorsolateral rows 1.2 – 1.5 times more than in ventrolateral ones. Anteriormost pore of dorsolateral rows situated at a distance less than amphidial c. b. d. behind amphid, and posteriormost one situated at posterior third of tail. Anteriormost pore of ventrolateral rows situated at a distance of approximately 1.5 amphidial c. b. d. behind amphid, and posteriormost one situated at anterior third of tail. Number of pores in rows varying in different specimens from 21 to 28 in dorsolateral rows and from 17 to 21 in ventrolateral rows. Location of pores in rows not absolutely regular, as distance between pores varying. As a rule, pores situated more sparsely in ventrolateral rows in region of midbody. Somatic setae 1.2 – 1.5 µm long, rare and irregularly situated. Sensilla of cephalic end arranged in 2 rings: 6 short, outer, labial setae 1.2 µm long at level of cephalic tip and there 4 submedian cephalic setae of about the same length near posterior border of cephalic capsule. Amphidial fovea monospiral, round, 55 – 67 % of c. b. d. in its diameter. There an amphidial aperture visible in holotype, which is less in diameter than amphidial fovea. From 5 to 7 cuticular annules visible between anterior end of amphid and cephalic capsule. Vestibulum short, cup-shaped, possessing 3 small sclerotized odontia. Small dorsal tooth visible in anterior quarter of stegostoma. Pharynx thin but has a well-developed terminal pear-shaped, or oval, bulb which being 61 – 86 % of c. b. d. in its width. Nerve ring being 2 / 3 of pharyngeal length from anterior end. Renetta with large cellular body located at level of beginning of intestine and outlet opening at 21 µm (approximately 2 amphidial c. b. d.) from anterior end. Cardia large and triangular. Reproductive system diorchic, with outstretched anterior testis, and with reflected posterior one. Posterior testis shorter and thinner then anterior one, situated at dorsal side, and poorly visible. Anterior testis lying dorsally from intestine, and small posterior one being to the right from intestine. Two zones of spermatogenesis are visible in anterior testes: small roundish spermatogonia with fine-grained content, large oval spermatogonia with fibrillar content. Vas deferens thick, 29 % of total body length, filled with puck-shaped spermatids approximately 6 µm in diameter with large-grained content. Spicules rather large, curved, 6 µm, with feebly marked knob at its distal end. Gubernaculum rod-like, slightly bent anteriorly. Supplementary organs not visible. Whole reproductive system occupying about a half of total body length. Tail conical. Three roundish cellular bodies of caudal glands visible close to anus. Females: Females similar to males in most parameters, however amphids smaller, 44 – 56 % of c. b. d. Reproductive system didelphic, amphidelphic, with outstretched ovaries, and occupying about 2 / 5 of total body length. Intestine pushed to dorsal side by reproductive system. Small part of dorsal wall of uterus opposite vulva being thicker and strongly sclerotized. Every ovary containing one mature elongated oocyte approximately 40 µm long. Spermatozoa 5.5 x 4.8 µm in size visible in uterus. Two pairs of vulvar glands seen. Abundance: The density of this species was 0.8 – 2.9 inds / 10 cm 2 and relative abundance within the nematode community was 1 – 3 % at the stations where it was found. Differential diagnosis: The peculiar feature of M. parviporosus sp. n. is the occurrence of four submedian rows of pores spreading along the whole body length. Only three Microlaimus species possessing the same feature have been described before: M. cyatholaimoides de Man, 1922 (according to Jensen (1978), whereas Hopper and Meyers (1967) mentioned the presence of four rows of short, fleshy setae associated with hypodermal glands for this species), M. porosus Bussau and Vopel, 1999, and M. discolensis Bussau and Vopel, 1999. M. parviporosus sp. n. differs from M. cyatholaimoides by the absence of preanal supplementary organs; by the total body length (360 – 415 µm vs 700 – 1000 µm in the latter species); by weakly cuticularized stoma with inconspicuous teeth vs. very sclerotized stoma with quite large teeth. The outer labial setae and the cephalic setae are of about equal length in the new species whereas the cephalic setae are much longer in M. cyatholaimoides. The new species differs from M. porosus by its 2 rings of head setae similar in length, whereas the cephalic setae are much longer than the outer labial ones in M. porosus. Besides, it differs from M. porosus by the shorter spicule (16 – 18 µm vs. 24 µm) and by the shape of spicule and gubernaculum (more curved and thicker spicule and gubernaculum are observed in the new species). The aperture of the amphid of the new species is narrower than the fovea, whereas it is of similar diameter in M. porosus. The new species differs from M. discolensis by its shorter head setae of two rings (1.2 µm vs. 6 – 9 µm); by the width of cephalic capsule (6 – 7 µm vs. 11 – 16 µm) by the number of pores on submedian rows (21 – 28 in dorsal rows and 17 – 21 in ventral rows vs. 35 – 45 and 9 – 15 respectively in M. discolensis); by the shape of outlet openings of hypodermal glands (pores vs short tubes with pores on its distal ends); by the length of spicule (16 – 18 µm in arc vs. 28 – 33 µm); by the shape of gubernaculum (curved vs. straight); by the character of annulation (there are wide furrows between the annuli in M. discolensis, whereas M. parviporosus does not possess such a feature). The hypodermal glands associated with pores were not observed in M. parviporosus in spite of M. discolensis, where these glands are very big and noticeable.	en	Miljutin, Dmitry M., Miljutina, Maria A. (2009): Deep-sea nematodes of the family Microlaimidae from the Clarion-Clipperton Fracture Zone (North-Eastern Tropic Pacific), with the descriptions of three new species *. Zootaxa 2096 (1): 137-172, DOI: 10.11646/zootaxa.2096.1.11, URL: https://biotaxa.org/Zootaxa/article/view/zootaxa.2096.1.11
03D8C423FF8BFFD0FF770B27E776FB96.taxon	description	(Figs 20 – 21, Table 7) Material examined: 4 females (Table 7). Locality: Tables 1, 7. Measurements: Table 7. Description of female: Body in shape of elongated spindle, with narrowed anterior end and conical tail. Non-annulated cephalic capsule present at anteriormost part of cephalic end. Length of cephalic capsule slightly more than its width. Cuticle of rest body annulated, annuli strongly pronounced, their width 0.9 – 1.1 µm. Cuticle thickness 0.7 µm at level of cephalic capsula and 1.0 – 1.1 µm along rest of body. Four submedian rows of round pores 1 µm in diameter situated along whole body. Number of pores in dorsolateral rows 1.2 – 1.5 times more than those in ventrolateral rows. Anteriormost pore of dorsolateral rows situated behind amphid at a distance approximately equal to amphidial c. b. d., and posteriormost one situated at posterior quarter of tail. Anteriormost pore of ventrolateral rows situated behind amphid close to it, and posteriormost one situated at a middle part of tail. Number of pores in rows varying in different specimens from 27 to 42 in dorsolateral rows and from 17 to 33 in ventrolateral rows. Pores located in rows regularly. Somatic setae very rare, irregularly situated, 1.5 µm long. Sensilla of cephalic end arranged in 2 rings: 6 short outer labial setae 1 µm long situated at anterior part of cephalic capsule and 4 submedian cephalic setae 2.5 µm long, situated at a distance of 2 / 3 of length of cephalic capsule from anterior end. Amphid monospiral, round, 40 – 50 % of c. b. d. in diameter. There are 8 – 11 cuticular annules between anterior end of amphid and cephalic capsule. Stoma present, with a greater length than that of cephalic capsula, however its posterior end not clearly visible. Walls of stoma thicker than in posterior pharyngeal lumen. Two teeth visible in stegostoma. Pharynx thin but having a well-developed terminal oval bulb, constituting 70 – 80 % of c. b. d. in width. Nerve ring situated at a level of middle of pharynx. Large cellular body of renetta located at level of beginning of intestine. Cardia quite large and round. Reproductive system didelphic, amphidelphic, with outstretched ovaries. It occupying approximately 40 % of total body length. Anterior ovary lies to the right of intestine, posterior one lies to the left of intestine. Mature oocyte elongated, its size 15 x 27 µm. Large spermatozoa of different shape visible in uterus. Vulvar glands seen. Abundance: The average density of this species was about 1.5 inds / 10 cm 2 and relative abundance within the nematode community was 1 – 2 % at the stations where it was found. Remarks: M. porosus was initially described by Bussau and Vopel (1999) from the South-Eastern Pacific area which is located about 5200 km from the area of the new finding. The specimens from the new area bear a good resemblance to the original description. The presence of 2 teeth in the stegostoma is unusual feature in the genus Microlaimus, where three teeth are described as a rule. Meanwhile, Bussau and Vopel (1999) also mentioned two teeth in the original description of M. porosus. Perhaps, 2 subventral teeth are touched very closely and optically seem fused when viewedunder light microscope.	en	Miljutin, Dmitry M., Miljutina, Maria A. (2009): Deep-sea nematodes of the family Microlaimidae from the Clarion-Clipperton Fracture Zone (North-Eastern Tropic Pacific), with the descriptions of three new species *. Zootaxa 2096 (1): 137-172, DOI: 10.11646/zootaxa.2096.1.11, URL: https://biotaxa.org/Zootaxa/article/view/zootaxa.2096.1.11
