Tachyusa sulciventris Eppelsheim, 1893

Pa ṡnik, Grzegorz, 2006, A revision of the World species of the genus Tachyusa Erichson, 1837 (Coleoptera, Staphylinidae: Aleocharinae), Zootaxa 1146, pp. 1-152 : 143-145

Tachyusa sulciventris Eppelsheim, 1893 ( Figs. 150–152)

Tachyusa sulciventris Eppelsheim, 1893: 37 .

Tachyusa (s. str.) sulciventris: Fenyes, 1920: 172 ; Bernhauer & Scheerpeltz, 1926: 586. Type material. Lectotype (here designated): ♂: O. E. Sibiria, Qucllgebiet, Iw., Leder 1891, Collect. Eppelsh. (NMW). Paralectotypes: 2♀♀: same data as the lectotype (NMW).

Additional material. Russia: Primorie , Lazovski Rayon , Lazo River valley near Lazovka, 4.VI.1997, Sundukow, 1 ex ( ISEA) ; Primorie , Lazovskiy Nature Reserve, Kordon Amerika, 18–19.VI.1997, Sundukow, 1 ex ( ISEA) ; 2 exx ( MSPC).

Redescription. Body. Length 3.2–3.8 mm, convex, parallel­sided, glossy; body colour pitchy brown to black; elytra reddish brown to dark brown, three basal tergites often paler, brownish red to brown, legs red, antennae brown with antennomeres 1–3 testaceous.

Head circular in outline; convex, eyes large, moderately protruding from lateral contours of head, length of each seen from above subequal to that of postocular region; surface of head without microsculpture; puncturation moderately fine and dense. Antennae short, clearly increasing in width apically, antennomeres 2 and 3 subequal in length, antennomeres 4–7 longer than wide, antennomeres 8–10 sexually dimorphic, quadrate in male and transverse in female, antennomere 11 nearly conical.

Pronotum subquadrate, lateral sides gradually narrowed in straight line to obtuse hind angles; before base with moderately small and shallow transverse impression; surface without microsculpture; puncturation fine, dense and asperate; pubescence at midline directed posteriorly.

Elytra subquadrate, at suture as long as pronotal length at midline; surface lacking microsculpture; puncturation relatively fine, dense and asperate.

Abdomen parallel­sided, bases of tergites 3–6 each with deep transverse impression, impressions with 7–8 longitudinal ridges, tergal puncturation fine and relatively sparse, punctures small and weakly visible, surface without microsculpture.

Male. Aedeagus as in Figs. 150–151.

Female. Spermatheca as in Fig. 152.

Remarks. Tachyusa sulciventris is apparently closely related to T. pseudosulciventris , from which it can be distinguished by the larger eyes, the antennomeres 2 and 3 subequal in length, the elytral puncturation similar to that on pronotum and by the shape of spermatheca.

Distribution. Tachyusa sulciventris is known from the Russian Far East.