Drepasiagonusa feldmanni, Assing, 2018

Assing, Volker, 2018, New species and additional records of Cephalocousya and Drepasiagonusa from China and Russia (Coleoptera: Staphylinidae: Aleocharinae: Oxypodini), Linzer biologische Beiträge 50 (1), pp. 75-88 : 86-87

Drepasiagonusa feldmanni nov.sp. ( Figs 33-36 )

T y p e m a t e r i a l: Holotype ♂: "O-Sibirien, VII.1997, Malkatschan-Delta , 150 km NW Magadan, N59°51'43 E154°11'24'' / Holotypus ♂ Drepasiagonusa feldmanni sp.n., det. V. Assing 2018" (cAss).

E t y m o l o g y: The species is dedicated to Benedikt Feldmann, to whom I owe the generous gift of the holotype.

D e s c r i p t i o n: Body length 3.8 mm; length of forebody 1.8 mm. Habitus as in Fig. 33 . Coloration: head and pronotum blackish; elytra blackish-brown with the sutural and posterior portions indistinctly and diffusely paler; legs dark-brown with the tarsi pale-yellowish; antennae and maxillary palpi yellow.

Head approximately 1.1 times as broad as long and of orbicular shape; punctation moderately sparse and extremely fine, barely noticeable in the pronounced microreticulation. Eyes slightly shorter than postocular region in dorsal view. Antenna approximately 1.0 mm long; antennomere IV approximately as long as broad; antennomeres V-X weakly transverse and gradually, weakly increasing in width, X less than 1.5 times as broad as long.

Pronotum approximately 1.15 times as broad as long and 1.1 times as broad as head, broadest in anterior half; punctation and microsculpture similar to those of head.

Elytra barely 0.9 times as long as pronotum; punctation dense and shallow, but much more distinct than that of head and pronotum; interstices with shallow microsculpture. Hind wings not examined. Metatarsomere I approximately as long as the combined length of II-IV.

Abdomen slightly narrower than elytra; tergites III-V with moderately deep, tergite VI with shallower anterior impressions; punctation rather dense and fine, but distinct; tergites III-V with shallow, tergites VI-VII with more distinct microreticulation; posterior margin of tergite VII with narrow rudiment of a palisade fringe.

♂: posterior margin of tergite VIII very weakly convex; posterior margin of sternite VIII obtusely produced in the middle ( Fig. 34 ); median lobe of aedeagus approximately 0.5 mm long and shaped as in Figs 35-36 .

♀: unknown.

C o m p a r a t i v e n o t e s: Drepasiagonusa feldmanni is distinguished from D. smetanai by numerous characters, particularly smaller body size, much finer punctation of the whole body, more pronounced microsculpture on the head and pronotum, much shorter and narrower elytra, smaller and less convex eyes, darker legs, and an aedeagus of completely different shape. It differs from D. tibetica and D. angulata by a much larger head (in relation to the pronotum), the habitus (proportions of head, pronotum, and elytra), finer punctation of the forebody, much shorter and narrower elytra, yellowish antennae, a longer metatarsomere I, the presence of a shallow anterior impression on the abdominal tergite VI, and by the shape of the median lobe of the aedeagus. For illustrations of the habitus and the mouthparts of D. smetanai see PACE (2012); the aedeagus and the spermatheca are illustrated in Figs 4-5.

D i s t r i b u t i o n: The type locality is situated to the northwest of Magadan, East Siberia. The holotype was collected with pitfall traps (FELDMANN pers. comm.).

Figures

Figs 33-39: Drepasiagonusa feldmanni (33-36) and D. procera (37-39): habitus (33); male sternite VIII (34); median lobe of aedeagus in lateral and in ventral view (35-36); head (37); female sternite VIII (38); spermatheca (39). Scale bars: 33: 1.0 mm; 34, 37-38: 0.2 mm; 35-36, 39: 0.1 mm.

Figs 1-9: Cephalocousya yunnanica (1-3), Drepasiagonusa smetanai (4-5), and D. procera (6-9): habitus (1, 6); spermatheca (2-3, 5); median lobe of aedeagus in lateral view (4); forebody (7); antenna (8); abdomen (9). Scale bars: 1, 6: 1.0 mm; 7-9: 0.5 mm; 2-3: 0.2 mm; 4-5: 0.1 mm.