Opisotretus spinosus, Golovatch, Sergei I., Geoffroy, Jean-Jacques, Stoev, Pavel & Spiegel, Didier Vanden, 2013
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publication ID |
https://dx.doi.org/10.3897/zookeys.302.5357 |
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persistent identifier |
https://treatment.plazi.org/id/77FCCF80-0E70-5C98-7DDB-9D8C1D5264FB |
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scientific name |
Opisotretus spinosus |
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sp. n. |
Opisotretus spinosus ZBK sp. n. Fig. 26
Type material.
Holotype ♂ (MZB), Indonesia, Java, Jawa Tengah, Cilicap, Nusakambangan Island, near Cave Goa Kali Empat, litter, sieving and Berlese extraction, 19.02.2011, leg. L. Deharveng & Dito (JAVA-NK32).
Paratype.
1 ♀ (MNHN JC 342), same locality, together with holotype.
Diagnosis.
Differs readily fromcongeners by the presence of a clear, bare hump on the ♂ vertex, coupled with the presence both of only a rudimentary solenomere and a peculiar spination of the apical piece (a) of the gonopod telopodite.
Name.
To emphasize the highly spinose apical piece of the gonopod telopodite.
Description.
Length of holotype ca 4 mm, width of midbody pro- and metazona 0.3 and 0.5 mm, respectively. Length of paratype ca 5 mm, width of midbody pro- and metazona 0.45 and 0.6 mm, respectively. Coloration in alcohol uniformly pallid.
Body with 19 (♂) or 20 (♀) segments. All characters like in Retrodesmus cavernicola sp. n., except as follows.
♂ head with an evident, bare, rounded vertigial hump (Fig. 26A, h). Antennae broken off, but obviously medium-sized.
In width, collum << segments 2 & 3 <head = 4 ≤ 5 <6=15 <(♂, ♀); thereafter body gradually tapering towards telson. Paraterga rather poorly developed (Figs 26B, C), starting from a subcordiform, broadly rounded collum, mostly faintly declivous and continuing the outline of a quite convex dorsum (especially so in ♀), largely set rather high, at about ¼ to 1/3 of midbody height, with faint shoulders frontolaterally (Figs 26B, C). Caudal corner of postcollum paraterga dentiform, always narrowly rounded and extending increasingly well behind rear tergal margin in segments 12-18 (♂) or 15-19 (♀). Lateral edge of paraterga with 2-3 or 3-4 small setigerous indentations in poreless and poriferous segments, respectively. Ozopores evident, round, flush open on dorsal surface, lying clearly in front of caudal margin at bottom of caudalmost lateral incision, both lateral and medial teeth being subequal (Figs 26B, C). Collum and each following metatergum with 3+3, rather long, bacilliform setae arranged in three regular transverse rows; polygonal bosses flat, poorly visible. Hypoproct subtrapeziform, as in Fig. 26D.
Legs rather short and stout, ca 1.2-1.3 (♂) or 1.0-1.1 times (♀) as long as midbody height; tarsi longest and particularly slender (Fig. 26E), sphaerotrichomes or other modified setae missing.
Gonopod telopodite (Figs 26F, G) clearly curved, unipartite, long and slender; apical piece (a) distal to a vestigial solenomere strongly curved due to a terminal uncus (u) bearing near its base a strong subcaudal spine (sp) and a field of spiniform orna mentations. An accessory seminal chamber at base of solenomere rather evident, but probably devoid of a hairy pulvillus.
Remarks.
This new Opisotretus species has been taken together with several immature females (18 segments) of a different, somewhat larger and slightly pigmented (reddish metaterga and antennae) opisotretid with somewhat broader paraterga and a different location of the ozopores (these being placed close to the caudal tergal margin) which could not be identified in the absence of adult male material.
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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