Mordellina (Pseudomordellistena) purcharti, Horák & Farkač & Nakládal, 2012

Horák, Jan, Farkač, Jan & Nakládal, Oto, 2012, Mordellidae (Coleoptera) from Socotra Island, Acta Entomologica Musei Nationalis Pragae 52, pp. 253-268 : 259-261

Mordellina (Pseudomordellistena) purcharti sp. nov.

( Figs. 22–31 )

Type locality. Yemen, Socotra Island, Homhil protected area, ca. 12°34′25″N, 54°18′53″E, 400– 510 m.

Type material. HOLOTYPE: J, Yemen, Socotra Island, Homhil area , 12°34′25″N 54°18′53″E, 400–510 m, at light, 9.–10.ii.2010, L. Purchart & J. Vybíral leg. ( NMPC).

Description. Male holotype. Body short, strongly rounded and convex ( Fig. 22 ). Ground colour blackish-brown, only anterior portion of frons, anteclypeus, labrum, mandibles, antennomeres I–III, protibiae and terminal spurs of metatibia yellowish brown.

Body length from tips of mandibles to tips of elytra 3.8 mm, to tip of pygidium 4.7 mm.

Head strongly convex, only slightly wider than long (width to length ratio 7.3: 7.0) and distinctly narrower than pronotum (ratio of head width to pronotal width 7.0: 9.0), distinctly prolonged at mouth part. Eyes ( Fig. 23 ) very large, almost circular, occupying almost half of head width (frontal view), only moderately narrowed towards mandibles, very coarsely facetted, with short and sparse setae. Posterior margin behind eyes with very narrow temporal border, temporal angles very small, but distinct. Maxillary palpus ( Fig. 24 ) rather small, palpomere II only moderately wider than palpomere III, terminal palpomere rather shortly securiform, 1.5 times longer than wide, its inner angle situated at midlength. Antennae ( Fig. 25 ) rather long, reaching shoulders, antennomeres I and II almost subequal, antennomere II as long as antennomere IV, antennomere III one fifth shorter and one fourth narrower than antennomere II, antennomere IV indistinctly narrower and one fourth shorter than antennomere V, antennomere V 1.4 times as long as wide, antennomeres V–X gradually slightly diminished, terminal antennomere oblong oval with narrower distal end, twice as long as wide and one third longer than preceding one.

Pronotum moderately convex, wider than long (width to length ratio 9.0: 7.4), anterior margin with distinct neck-shaped protuberance. Lateral margin of pronotum only moderately emarginate, posterior angles nearly rectangular and rounded at tip. Dorsal surface with fine and dense punctation.

Scutellum small, triangular, with rounded apex.

Metepisterna long, three times longer than wide, at base twice as broad as on sternal side, which is truncate.

Elytra strongly rounded, almost twice as long as their combined width at shoulders, separately rounded at tip. Punctation dense and rather coarse, rasp-like.

Pygidium narrowly conical, 2.5 times longer than hypopygium, rather short, reaching third of elytral length.

Protibiae ( Fig. 26 ) distinctly curved inward, with distinct calf-like swelling and without setae at base. Protarsomere I almost as long as two following ones combined, protarsomere IV narrow, almost one third longer than wide, truncate at apex; protarsomere V long, twice as long as tarsomere IV. Mesotibiae distinctly longer than mesotarsi. Metatibiae ( Fig. 27 ) besides short apical ridge reaching one third of tibial width, with two very oblique lateral ridges, upper lateral ridge very long and nearly twice as long as lower one. Metatarsomeres I–II with two very oblique ridges. Outer terminal spur of metatibia reaching one fourth inner one.

Genitalia as in Figs. 28–30 , shape of urosternite VIII as in Fig. 31 .

Female. Unknown.

Differential diagnosis. The new species is similar to M. (P.) fuscobrunnea Ermisch, 1952 from the Congo ( ERMISCH 1967), from which it differs in very large and coarsely facetted eyes and in different proportion of terminal antennomere. Diagnostic characters are included in key to species.

Etymology. Dedicated to Luboš Purchart (Mendel University, Brno, Czech Republic), who underwent, along with Jan Vybíral (Brno, Czech Republic), collecting trip to Socotra Island, which led to the discovery of this species.

Figures

Figs. 22–31. Mordellina (Pseudomordellistena) purcharti sp. nov. holotype. 22 – habitus; 23 – eye; 24 – maxillary palpus; 25 – antenna; 26 – protibia and tarsus; 27 – metatibia and tarsus; 28 – paramere; 29 – phallobasis; 30 – apical part of penis; 31 – sternite VIII. Scale: a – 24; b – 27; c – 22; d – 28; e – 29–30; f – 23, 31; g – 25–26.