Socotralabis, Kočárek, 2014

Kočárek, Petr, 2014, Earwigs (Dermaptera) of Socotra Island: checklist, distribution, and description of a new genus and four new species, Acta Entomologica Musei Nationalis Pragae 54, pp. 1-21 : 2-3

Socotralabis gen. nov.

( Figs 1–5 )

Type species. Socotralabis hulai sp. nov., designated here.

Description. Head as long as wide; antennomere 1 long, narrowed basally, widened terminally, as long as length of antennomeres 2–4 combined; antennomere 2 transverse, only slightly longer than wide; antennomere 3 longer than antennomere 4. Antennomeres 2–4 cylindrical, other antennomeres conical. Pronotum approximately as long as wide, widened posteriorly, meso- and metanotum transverse; mesonotum truncate posteriorly, metanotum broadly emarginate. Prosternum longer than wide, constricted laterally in posterior third, posterior margin truncate; mesosternum approximately as long as wide, posterior margin rounded; metasternum approximately as long as wide, trigonal, widest at base and tapering to truncate tip. Tegmina and wings entirely absent. Legs comparatively long, femora stout; tibiae clad with thick and fine setae; metatarsomere 1 nearly as long as metatarsomeres 2–3 combined. Abdominal tergites, except for ultimate tergite, convex, somewhat widened posteriorly; lateral glandular folds not visible. Ultimate tergite transverse. Pygidium flat. Both branches of male forceps remote and stout at base, gradually tapering apically, apices gently hooked, inner margin finely crenulated, trigonal in basal half, and depressed posteriorly. Right branch more curved in distal third than left branch. Female forceps with contiguous branches, simple and straight. Male genitalia with short parameres, 1.6–1.8 times longer than wide, narrowed apically; external apical angle and margin convex, tip with a remarkable incision in middle. Incision of parameres situated at interface of inner and outer membranes, with median membrane extending to deepest part of incision. Longer genital lobe between 1.5–1.6 times longer than length of paramere.

Differential diagnosis. The new genus corresponds to the general body shape of Anisolabidinae , but differs from the other genera in the structure of the male genitalia with characteristically excised parameres. Except for Socotralabis gen. nov., excised parameres occur only in the monotypic Oriental genus Ornatolabis Steinmann, 1988 , in which the excision of the tip of the parameres is situated entirely in the outer membrane. In Socotralabis gen. nov., the excision is situated in the inner membrane near the interface of the inner and outer membranes.

Etymology. The name is modified from the name of the family Anisolabididae , - labis, using the Greek prefix Socotra-, which refers to Socotra Island; gender feminine.

Figures

Figs 1–5. Socotralabis hulai sp. nov. 1 – habitus of male holotype; 2 – male penultimate sternite, ventral view; 3 – ultimate tergite and forceps of female paratype; 4 – male genitalia; 5 – right paramere of male genitalia.