Delarthrum anomalans, Golovatch & Aswathy & Bhagirathan & Sudhikumar, 2021
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publication ID |
https://doi.org/10.11646/zootaxa.5068.4.2 |
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publication LSID |
lsid:zoobank.org:pub:F769B986-8F7B-4ABF-A7EF-58A813718760 |
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DOI |
https://doi.org/10.5281/zenodo.5709520 |
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persistent identifier |
https://treatment.plazi.org/id/3A1C87D9-970D-FFCC-FF1F-2A8CBDD8A0CE |
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treatment provided by |
Plazi |
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scientific name |
Delarthrum anomalans |
| status |
sp. nov. |
Delarthrum anomalans sp. nov.
Figs 69–87 View FIGURES 69–73 View FIGURES 74–80 View FIGURES 81–87 .
Material examined. Male holotype (CATE-61604A), 2 male (CATE-61604B and CATE-61604C) and 2 female paratypes (CATE-61604D and CATE-61604E), India, Kerala state, Thrissur district , 10°21’19’’N, 76°12’48’’E, 29 m a.s.l. GoogleMaps , in June 2021 and 1 male (CATE-61604J) and 2 female paratypes (CATE-61604K and CATE-61604L all in 5302B–CATE-5302I) from the sacred groves of Valliyur kavu, Manathavady, Wayanad district , 11°48’08’’N, 76°01’55’’E, 716 m a.s.l., M.D. Aswathy leg. GoogleMaps
Name. To emphasize the anomalous absence of adenostyles from both male legs 1 and 2.
Diagnosis. Differs from congeners by the absence of adenostyles from both male legs 1 and 2, coupled with the sexually dimorphic colour pattern, the transverse tergal sulci starting with the collum, and the peculiar gonopodal conformation, primarily the presence of a small, thumb-shaped, distoventral projection ( a) basal to the division of the postfemoral part into (1) the main, dorsal piece of the solenophore ( sph), which is long, obliquely truncate dorsad at the base, bifid in the distal third and slightly curved mesad, and (2) a dorsal process that is split immediately at the base into a longer, stalked, leaf-shaped outgrowth ( b) with peculiar, ragged, saw-like distal margins, and a much shorter, simple, dorsobasal peg ( z) ( Figs 84–87 View FIGURES 81–87 ).
Description. Length of holotype, 17.9 mm, of paratypes, 17.0–17.6 mm (male) or 14.0–14.8 mm (female). Width of midbody rings, 2.6 mm ( holotype), 1.9–2.1 mm (male paratypes) or 2.0–2.3 mm (female paratypes). Coloration sex-dimorphic: in vivo, dorsum dark brown to black, venter chestnut brown (male) ( Figs 69, 70 View FIGURES 69–73 ) to yellowish white (female) ( Fig. 71 View FIGURES 69–73 ); paraterga mostly contrasting pale. Legs light brown (male) or whitish (female). Coloration after one month of preservation in 96% ethanol somewhat darkened, but pattern evident ( Figs 69–76 View FIGURES 69–73 View FIGURES 74–80 ).
Body with 20 rings in both sexes. In width, collum <head <ring 2<3<4<5<6<7<8<9=10, body gradually tapering thereafter ( Figs 72, 73 View FIGURES 69–73 ). Vertex glossy and bare; stipes, cardo and clypeus moderately setose, epicranial sulcus distinct and ending before the level of antennal sockets. Clypeal region with ca 5+5 setiferous pits. Antennae moderately long, only slightly clavate, extending back to ring 4 when stretched caudolaterally ( Figs 72 View FIGURES 69–73 , 74 View FIGURES 74–80 ). Relative antennomere lengths: 1<6<4<2<5<3. Antennomere 6 broadest apically, post-antennal groove shallow, diameter of antennal socket and isthmus between sockets subequal, 0.24 and 0.23 mm, respectively ( Fig. 77 View FIGURES 74–80 ). Antennomeres 5–7 each with a distinct dorso-apical group of basiconic sensilla (both male and female), these being especially conspicuous on antennomere 5 ( Figs 72 View FIGURES 69–73 , 74 View FIGURES 74–80 ).
Paraterga mostly well developed, keel-shaped, set at about upper third of body height ( Figs 69–76 View FIGURES 69–73 View FIGURES 74–80 ). Collum ovoid, paraterga small, subtriangular and broadly rounded. Anterior margin of collum with a single transverse row of fragile short setae ( Fig. 72 View FIGURES 69–73 ). Anterior and posterior margins of following rings rather straight and parallel. Anterior margin with a transverse row of 2+2 short setae similar to those on collum. Paraterga 2 as usual, set clearly lower than 3 rd, squarish in shape, anterior corner/lobe drawn anteriad. Following paraterga 3–17 regularly rounded anterolaterally and increasingly drawn caudolaterad into acute triangles, but still lying within rear tergal margins ( Figs 72–76 View FIGURES 69–73 View FIGURES 74–80 ), vs. small, spiniform and slightly drawn past rear tergal margin on rings 18 and 19 ( Figs 73 View FIGURES 69–73 , 76 View FIGURES 74–80 ). Lateral calluses of paraterga thin, only slightly thicker on pore-bearing rings than on poreless ones ( Figs 69, 70 View FIGURES 69–73 ), smooth, delimited by distinct sulci both dorsally and, to a lesser degree, ventrally; usually with a few short setae retained at lateral margin.
Tegument generally smooth and shining, prozonae very delicately shagreened, metazonae mostly striate/striolate at bases of paraterga and near transverse sulci, surface being slightly undulate ( Figs 72, 73 View FIGURES 69–73 ). Tergal setae mostly short and inconspicuous, present both on paraterga and in anterior half of metaterga. Two deep transverse sulci present on collum ( Fig. 72 View FIGURES 69–73 ), followed by one prominent sulcus on metazonae 2–18, smooth at bottom and reaching the base of paraterga ( Figs 72, 73 View FIGURES 69–73 ). A faint axial line traceable on most metazonae until 18 th ( Figs 72, 73 View FIGURES 69–73 ). Strictures between pro- and metazonae narrow, nearly smooth, at most faintly striolate ( Figs 72–76 View FIGURES 69–73 View FIGURES 74–80 ).
Pore formula normal (5, 7, 9, 10, 12, 13, 15–19), ozopores small, circular, opening at ca 1/3 off caudolateral corner of pore-bearing calluses ( Figs 74–76 View FIGURES 74–80 ). Pleurosternal carinae decreasing in size from 2 to 4. Epiproct conical and flattened dorsoventrally, extending well beyond anal valves; tip truncate, subapical lateral incisions evident; hypoproct subtriangular, with 1+1 setae on minute knobs ( Fig. 79 View FIGURES 74–80 ).
Legs moderately long and slender, clearly longer and thickened in male compared to female ( Figs 70, 71 View FIGURES 69–73 ), rather densely setose ventrally and with short claws; male legs with tarsal brushes absent only from last two leg-pairs ( Figs 74–76, 78 View FIGURES 74–80 , 83 View FIGURES 81–87 ). Prefemora and coxae each bearing a moderately long and stiff distoventral seta. Podomere length ratios: coxa <prefemur <tibia = postfemur <tarsus <femur ( Fig. 83 View FIGURES 81–87 ). Neither male leg-pair 1 nor 2 with any adenostyles, only coxae 2 as usual, with gonopores on small knobs ( Figs 81, 82 View FIGURES 81–87 ). Sternal lobe between male coxae 4 small, conical and densely setose.
Gonopodal aperture transverse and suboval in shape, about 2/3 as wide as prozonite 7, its rim being not elevated, but thickened laterally ( Fig. 78 View FIGURES 74–80 ). Gonopods high, complex, in situ held parallel to each other ( Figs 78, 80 View FIGURES 74–80 ). Coxite darkened, about as long as femorite, subcylindrical, setose distoventrally ( Figs 84–87 View FIGURES 81–87 ); cannula a short curved tube, as usual. Prefemoral part short, globose, densely setose as usual, with a particularly long seta distoventrally. Femorite ( fe) relatively stout and short, somewhat enlarged distad, subclavate, almost as long as acropodite (= postfemoral part), subcylindrical, without evidence of torsion; a small, thumb-shaped, distoventral projection ( a) basal to acropodite bifurcation into a longer, larger, more slender, subacuminate, ventral, solenophore branch ( sph), rather slightly curved dorsad and bearing both a strong spine ( k) in distal third and a free solenomere ( sl), and a shorter, more elaborate, dorsal process divided immediately at base into a longer, stalked, leaf-shaped outgrowth ( b) with peculiar, ragged, saw-like distal margins, and a much shorter, simple, dorsobasal peg ( z). Seminal groove first running all along mesal side of femorite, then turning slowly towards bifurcation point before moving onto a free, flagelliform sl tightly attached to mesal side of sph, with only a short tip of sl remaining exposed over sph. Division of fe and acropodite through a transverse sulcus, or of sph into laminae, wanting ( Figs 84–87 View FIGURES 81–87 ).
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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Alogolykinae |
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Polydrepanini |
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