Socotralabis hulai, 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 : 4-6

Socotralabis hulai sp. nov.

( Figs 1–5 , 28 )

Type locality. Yemen, Socotra Island, Wadi Matyaf [= Mathif], 12°27′28.38″N, 54°18′22.32″E, ca. 50 m a.s.l.

Material examined. HOLOTYPE: J, ‘ Republic of Yemen / Socotra Isl., Wadi Mathif / N12°27′28.38″, E54°18′22.32″ / V Hula lgt. 20.6.2009 // HOLOTYPUS / Socotralabis / hulai sp. nov. / det. P. Kočárek 2013 ’ ( NMPC). PARATYPES: 2 JJ 1 ♀, same label data as holotype ( NMPC, PKCO) ; 4 JJ 3 ♀♀, ‘ Yemen Socotra Island / Hagher Mts. , Scand Mt. env./ montane evergreen woodland / 16.-18.vi.2012 / 12°34.6′N, E54°01.5′ E, 1450 m // Socotra expedition 2012 / J. Bezděk, J. Hájek, V. Hula, P. Kment, I. Malenovský, J. Niedobová & L. Purchart lgt.’ ( MMBC, NMPC, PKCO). Each of the paratype specimens is provided with an additional printed red label : ‘ PARATYPUS / Socotralabis / hulai sp. nov. / det. P. Kočárek 2013 ’.

Description. Male. Body reddish brown, shiny; antennae unicolor, pronotum reddish brown with paler sides, legs yellowish brown, forceps reddish brown. Cuticle punctured, shiny; tegmina and wings entirely absent.

Head ( Fig. 1 ) as long as wide; postfrontal and coronal sutures fine but distinct; frons convex; posterior margin of head feebly emarginate in middle. Eyes blackish brown, approximately 0.5 times as long as head length posterior to eyes. Antennae of male holotype with 19 antennomeres, female paratype with 20 antennomeres (both incomplete); antennomere 1 long, narrowed basally, widened terminally, as long as 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. All antennomeres pubescent.

Pronotum ( Fig. 1 ) smooth, approximately as long as wide, widened posteriorly; anterior margin nearly straight, lateral and posterior margins straight. Median sulcus fine but distinct. Meso- and metanotum transverse, smooth; mesonotum truncate posteriorly, metanotum broadly emarginate. Median sulcus visible on mesonotum, absent on metanotum. 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. Legs comparatively long, yellowish brown; femora stout; tibiae with thick and fine setae; length of metatarsomere 1 nearly equal to metatarsomeres 2–3 combined.

Abdomen ( Fig. 1 ) sparsely punctulate. Tergites (except for ultimate tergite) convex, somewhat widened posteriorly; lateral glandular folds not visible; antero-lateral parts of tergites with pairs of small longitudinal smooth areas. Tergites 7–9 rugoso-striate at sides, each with low blunt rugoso-striate lateral longitudinal ridge. Ultimate tergite transverse; sides convex, slightly narrowed anteriorly, and slightly depressed medially with visible median longitudinal furrow; lateral longitudinal ridge rugoso-striate, posterior margin in middle slightly concave. Penultimate sternite narrowed posteriorly, with posterior margin subtruncate or slightly emarginate ( Fig. 2 ). Pygidium flat. Forceps asymmetrical, right branch more curved in distal third than left branch; both branches subcontiguous and stout at base, gradually tapering apically, nearly straight in basal two thirds, and slightly incurved afterwards; apices gently hooked, inner margin finely crenulated, dorsally trigonal in basal half, depressed posteriorly.

Genitalia ( Figs 4, 5 ) with short parameres, 1.6 times longer than wide, broadened in middle and narrowed apically; external apical angle and margin convex. Tip of parameres with a remarkable incision in middle ( Fig. 5 ); incision situated at interface of inner and outer membranes, with median membrane extending to deepest part of incision. Longer genital lobe 1.5 times longer than length of paramere ( Fig. 4 ).

Female. Agrees with male in most characters except for: penultimate sternite with posterior margin regularly rounded; posterior margins of all tergites smooth, or only middle parts of tergites 6–7 gently rugoso-striate, but with not developed lateral longitudinal ridge; ultimate tergite comparatively narrowed posteriorly with posterior margin slightly emarginated; forceps with simple and straight contiguous branches ( Fig. 3 ).

Measurements. Total body length without forceps:JJ: 9.4–15.6 mm, holotype 14.8 mm; ♀♀: 11.2–18.7 mm. Length of forceps:JJ: 1.6–2.7 mm, holotype 1.7 mm; ♀♀: 2.2–2.9 mm. Differential diagnosis. Socotralabis hulai sp. nov. differs from S. bezdeki sp. nov. in the following combination of characteristics: S. hulai sp. nov. is a thicker species with posteriorly widened abdomen; male tergites 7–9 are rugoso-striate at the sides, and each has a low blunt rugoso-striate lateral longitudinal ridge; the parameres of the male genitalia are wider, 1.5 times longer than wide.

Etymology. The species is named after one of its collectors, Vladimír Hula (Brno, Czech Republic).

Bionomy. Unknown. The species was collected in an area of a montane evergreen woodland.

Distribution. Yemen, Socotra Island ( Fig. 28 ). Most likely an endemic species.

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.

Figs 27–29. Sketch maps of Socotra Island displaying the known and newly recorded distribution of Dermaptera. Published records are based on HAAS at al. (2004); the occurrence of Labidura riparia (Pallas, 1773) on Samha Island published by these authors is not displayed.