Pycnoglypta cornuta Shavrin, 2010

Shavrin, Alexey, 2010, Contribution to the knowledge of the fauna of the tribe Omaliini McLeay, 1825 (Coleoptera: Staphylinidae: Omaliinae) of the Baikal region and adjacent territories, Baltic Journal of Coleopterology 10 (1), pp. 27-43 : 36-38

Pycnoglypta cornuta Shavrin , sp.n. ( Fig. 6-12 )

Pycnoglypta maritima : Shavrin, 1998:82; Pycnoglypta maritima : Shavrin, 2000:75;

Pycnoglypta maritima : Shavrin, 2001:83

Type material. Holotype: IRKUTSK area: m#, Irkutskiy district, 17 th km on the Baikal higway, 11.08.1995, A. Anishchenko ( ZMM).

Paratypes: IRKUTSK area: m#, Usol‘skiy district, vallet of Kitoy river opposite Neudachnykh island , 14- 16.07.1996, A. Shavrin ( CS) ; BURYATIA republic: m#, Dzhidinskiy district , 6 km SE Dzhida river, 27.07.2006, A. Shavrin ( CS) ; 2 f#, same district, Verkhniy Dyrestuy , 5.07.1997, swamp, A. Shavrin ( CS) .

Description. Measurements (min-max; n=5): WH: 0.42–0.48; LH: 0.31–0.35; LA: 0.66; LE: 0.13–0.14; LT: 0.05; LP: 0.38–0.46; WP: 0.59–0.62; LES: 0.6– 0.73; WE: 0.72–0.79; WA: 0.74–0.84; LAE: 0.3. Body length: 2.36–2.8 (holotype - 2.36).

Body yellowish-brown to dark brown; antennae, mouthparts yellowish brown, apical three antennomeres slightly darkened.

Head distinctly smaller than pronotum, 1.3 times wider than long. Eyes 2.6 –2.8 times longer than temples. Head dorsally without microsculpture, with several fine punctures in its lateral portions, with band of moderately coarse, dense punctures along midline from clypeus basis to nuchal furrow, the band bordered on each side by impunctate zone. Surface along internal border of eyes and behind them with longitudinal striae. Ocelli very small, visible under strong magnification at light coloured specimens as dark pigmented spots, or obsolete. Antennae with three apical antennomeres forming a loose club. Length / width of antennomeres are: I: 0.11 × 0.05; II: 0.07 × 0.04; III: 0.06 × 0.04; IV–V: 0.04 × 0.03; VI: 0.05 × 0.03; VII: 0.05 × 0.04; VIII: 0.04 × 0.05; IX–X: 0.05 × 0.07; XI: 0.1 × 0.07.

Pronotum moderately convex, transverse, 1.3– 1.4 times broader than head, 1.3–1.5 wider than long; without microsculpture, with coarse and dense puncturation, distance between punctures 1–1.5 times as diameter of punctures; punctures coarser than those on the head; with short median longitudinal band along midline posteriorly.

Scutellum triangular, without punctation and microsculpture.

Elytrae slightly convex, 1.5–1.6 times longer than pronotum; punctation denser than on pronotum but not coarser; distances between punctures 1.5 times as diameter of punctures; without microsculpture, glossy. Wings reduced to very small vestiges.

Abdomen convex, approximately as wide as elytrae, with very fine and sparse puncturation and dense microsculpture. Tergite IV with small circular patches of wing folding spicules.

Male: Protarsi with dilated tarsomeres. Apical margins of sternites VI-VIII each with distinct median lobe; lobe of sternite VI large, triangular; lobe of sternite VIII flat, elongate, rounded apically. Aedeagus as in Fig. 6-7 . Tergite VIII as in Fig. 8 . Sternite VIII as in Fig. 9 .

Female: Protarsi with less dilated tarsomeres. Tergite VIII ( Fig. 10 ) with deep round impression in median portion. Sternite VIII as in Fig. 11 . Female accessory sclerite as in Fig. 12 .

Comparative notes. Based on the primary and secondary sexual characters, P. cornuta is most closely related and most similar to P. maritima , described by Gusarov (1995:236) from the Maritime province (type locality: ” Russia: Primorsk Terr., Dalnegorsk Reg., Rudnaya Pristan’, Smychka”). The new species differs from P. maritima by significant larger body, coarser puncturation of pronotum and elytrae, as well as by the distinct shape of the adeagus (aedeagus of P. cornuta is wider, paramerae shorter, median lobe lancet-shaped apically, and apex of aedeagus sclerotized, with wider emargination) and by the other structure of endophallus.

Remarks. Based on the morphology of apical tergites and sternites, as well as the shape of the aedeagus, P. cornuta belongs to the lurida species goup, which was defined by Gusarov (1995:230).

Etymology. The name derives from Latin adjective, and alludes to the horn-shape apex of the aedeagus in lateral view.

Figures

Figs. 6-12. Pycnoglypta cornuta Shavrin, sp.n. 6-9 – male (6 – aedeagus, ventral view; 7 – aedeagus, lateral view, 8 - tergite VIII, 9 – sternite VIII), 10-12 – female (10 – tergiteVIII, 11 – dterniteVIII, 12 – female accessory sclerite). Scale bar 0.1 mm.