Anisolabella planata, 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 : 9-11

Anisolabella planata sp. nov.

( Figs 11–15 , 27 )

Type locality. Yemen, Hagher Mts., Scand Mt, 12°34.6′N, 54°01.5′E, 1,450 m a.s.l.

Material examined. HOLOTYPE: J, ‘ Socotra Is. ( YE) / Al Haghier Mts. Scant Mt. env. / 12°34.6′N, 54°01.5′E, 1450 m / Jan Batelka leg. 12-13.xi.2010 // HOLOTYPUS / Anisolabella / planata sp. nov. / det. P. Kočárek 2013 ’ ( NMPC). PARATYPES: 1 J 1 ♀, same label data as holotype ( NMPC) ; 1 J, ‘ Yemen Socotra Island / Hagher Mts. , Scand Mt. env. / montane evergreen woodland / 16.-18.vi.2012 / 12°34.6′N, 54°01.5′E, 1,450 m // Socotra expedition 2012 / J. Bezděk, J. Hájek, V. Hula, P. Kment, I. Malenovský, J. Niedobová & L. Purchart lgt.’ ( PKCO). Each of the paratype specimens is provided with an additional printed red label : ‘ PARATYPUS / Anisolabella / planata sp. nov. / det. P. Kočárek 2013 ’.

Description. Male. Body dorsoventrally depressed, reddish brown, shiny; head dark reddish brown, antennae, pronotum, mesonotum, metanotum and legs pale reddish brown, abdomen and forceps blackish brown. Cuticle punctured, shiny; tegmina and wings entirely absent.

Head ( Fig. 11 ) as wide as long, postfrontal and coronal sutures fine, but distinct, frons convex, vertex flattened, posterior margin of head feebly emarginate in middle. Eyes reddish brown, approximately 0.5 times as long as length of head posterior to eyes. Antennae of paratype male with 21 antennomeres (in holotype incomplete), in female paratype with 22 antennomeres; antennomere 1 shorter than distance between antennal bases, narrowed basally, widened terminally, slightly longer than antennomeres 2–4 combined; antennomere 2 transverse, wider than long; antennomere 3 nearly as long as antennomere 4–5 combined. Antennomeres 2–21(22) cylindrical; distal antennomeres long and thin, 6–7 times longer than wide. All antennomeres pubescent, setae long, as long as, or longer than width of antennomeres.

Pronotum ( Fig. 11 ) smooth, about as long as broad, slightly widened posteriorly; anterior margin nearly straight, lateral margins slightly concave, posterior margin nearly straight. Median sulcus fine but distinct. Meso- and metanotum transverse, smooth; mesonotum posteriorly truncate, metanotum broadly emarginate. Median sulcus visible on mesonotum, on metanotum absent. Legs comparatively long, pale reddish brown; femora stout; tibiae with thick and fine setae; metatarsi with metatarsomere 1 of almost equal length as metatarsomeres 2–3 combined.

Abdomen ( Fig. 11 ) sparsely punctulate, tergites (except for ultimate tergite) convex, somewhat widened posteriorly; lateral glandular folds invisible. Tergites 6(7)–9 rugoso-striate at posterior margins. Ultimate tergite transverse, rugose, sides convex, slightly narrowed posteriorly, depressed medially with weak striate median longitudinal furrow, lateral sides and posterior margin rugoso-striate. Penultimate sternite narrowed posteriorly, with posterior margin subtruncate and slightly emarginate ( Fig. 12 ). Pygidium flat. Forceps asymmetrical, right branch more curved in middle than left one; right branch noticeably widened interiorly in distal quarter. Both branches remote and stout at base, tapering apically, with apices gently hooked; inner margin finely crenulated, dorsally trigonal in basal half, depressed posteriorly.

Genitalia ( Figs 14, 15 ) with oval short parameres, parameres 1.8 times longer than broad, broadened in middle and narrowed apically, external apical angle and margin convex; tip of parameres rounded ( Fig. 15 ). Longer genital lobe 1.7 times longer than length of paramere ( Fig. 14 ).

Female. Agrees with male in most characters except for: posterior margins of tergites 6(7)–9 smooth, not rugoso-striate; penultimate sternite narrowed posteriorly, with posterior margin subtruncate and broadly rounded; ultimate tergite comparatively narrowed posteriorly and forceps with branches contiguous, simple and straight, with crenulated inner margin ( Fig. 13 ).

Measurements. Total body length without forceps:JJ: 15.2–17.8 mm, holotype 17.8 mm; ♀: 12.9 mm. Length of forceps: JJ: 2.5–3.1 mm, holotype 3.1 mm; ♀: 3.9 mm.

Differential diagnosis. Anisolabella planata sp. nov. differs from the other species of the genus Anisolabella based on the following combination of characteristics: the body is flattened with a noticeably flattened vertex of the head; antennomeres 2–22 are cylindrical, the distal antennomeres are long and thin, 6–7 times longer than wide; the right branch of the male forceps is widened interiorly in the distal quarter, and the abdominal tergites of male lack keels or ridges laterally; the penultimate sternite of male is narrowed posteriorly, with the posterior margin subtruncate and slightly emarginate. The parameres of the male genitalia are specific, oval, and broadened in the middle, 1.8 times longer than wide. It can be distinguished from the other Anisolabella species occurring on Socotra Island, A. haasi sp. nov., using the identification key below.

Etymology. The Latin adjective, planatus (- a, -um; = flattened) is given in reference to the dorsoventrally flattened body of the new species, which is unusual in Anisolabella .

Bionomy. Sifted from wet leaf litter in a montane evergreen woodland, association Leucado hagghierensi-Pittosporetum viridiflorum, see also the preceding species.

Distribution. Yemen, Socotra Island ( Fig. 27 ). Most likely an endemic species.

Figures

Figs 11–15. Anisolabella planata sp.nov.11 – habitus of male holotype; 12 – male penultimate sternite, ventral view; 13 – ultimate tergite and forceps of female paratype; 14 – male genitalia; 15 – left 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.