Permocryptops shelleyi, Kopylov, 2018
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publication ID |
https://doi.org/ 10.4202/app.00482.2018 |
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persistent identifier |
https://treatment.plazi.org/id/DD5F87D5-7F55-0056-FFF2-F91B993B61E9 |
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treatment provided by |
Felipe |
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scientific name |
Permocryptops shelleyi |
| status |
sp. nov. |
Permocryptops shelleyi sp. nov.
Fig. 2 View Fig .
Etymology: In honour of Rowland Shelley, formerly of the North Carolina State Museum of Natural History, who wrote a useful monograph on the scolopendomorph centipedes of North America.
Holotype: PIN 3840 View Materials /3165, part and counterpart; distal part of the specimen well-preserved, proximal part badly damaged.
Type locality: Isady (Mutovino) locality, Sukhona River, Vologda Region, Russia.
Type horizon: Mutovino beds, Poldarsa Formation, Severodvinian Stage, upper Permian.
Diagnosis.—Distinct from previously known fossil scolopendromorph centipedes and from Permocrassacus novokshonovi gen. et sp. nov., described above, in having acute ventrodistal spines and pores on the coxae of the ultimate legs.
Description. —The fossil (part) preserves the 12 posteriormost segments and numerous legs, including the ultimate ones. The actual number of trunk segments cannot be counted, and based on extant species could be either 21 or 23. We assume for purposes of this description that the number is 21, but in Fig. 2B View Fig the numbers in parentheses indicate the segment designations if the actual number is 23. Some more anterior structures are preserved on the counterpart, but are too poorly preserved to describe. It appears that during preservation the animal was rolled over slightly to its left, exposing the intersegmental membrane particularly posteriorly on the right side. Length (from anterior margin of 10 th tergite to posterior edge of 21 st coxae), 17.7 mm, maximum width 2.7 mm. Posterior 12 pedigerous segments relatively well preserved, along with parts of legs 14–21 on the right side, and left leg 20. Tergites nearly uniform in size, with either straight or slightly convex, arcuate posterior margins, lacking paramedian sulci, which become less distinct posteriorly; tergite 21 missing, exposing the 21 st coxae. Legpair 20 appears longer and stouter than the preceding pairs, but this may be due to the left leg 20 having been twisted slightly to give an anteriolateral view. Ultimate legs (legpair 21) elongate (11.2 mm long) but not much enlarged in thickness as compared to legpair 20, coxae with extensive ventrolateral pore fields and stout distal spine, preserved podomeres tapering from prefemur to tarsus, prefemur 3–4 times longer than thick.
Stratigraphic and geographic range.— Type locality and horizon only.
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