Drepasiagonusa tibetica, 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 : 84-85

Drepasiagonusa tibetica nov.sp. ( Figs 10-21 )

T y p e m a t e r i a l: Holotype ♂: " CHINA: N-Yunnan Diqing Tibet. Aut. Pr. Zhongdian Co. Xue Shan, 23 km S Zhongdian 27°38.3'N 99°41.5'E 3675-3725 m, 2.VI.2005 A. Smetana [C149] / Holotypus ♂ Drepasiagonusa tibetica sp.n., det. V. Assing 2018" (cSme) . Paratypes: 10 exs.: same data as holotype (cSme, cAss) ; 2 exs.: " CHINA: N-Yunnan Diqing Tibet. Aut. Pr. Zhongdian Co. Xue Shan near lake, 23 km S Zhongdian 27°37.1'N 99°38.5'E 3895 m, 15.VI.2005 A. Smetana [C161]" (cSme, cAss); 1 ex.: " CHINA: N-Yunnan Diqing Tibet. Aut. Pr. Bitai Hai Lake area , 29 km ESE Zhongdian 27°43.65'N 99°58.97'E 3540 m, 1.VI.2005 A. Smetana [C147]" (cSme) .

E t y m o l o g y: The specific epithet is an adjective derived from Tibet.

D e s c r i p t i o n: Body length 2.6-3.7 mm; length of forebody 1.4-1.8 mm. Habitus as in Fig. 10 . Coloration: body black; legs dark-brown to blackish-brown with the tarsi pale-brown; antennae dark-brown to blackish-brown with the basal 2-3 antennomeres paler brown; maxillary palpi dark-brown.

Head approximately as broad as long; punctation moderately dense and very fine, visible only at higher magnification; interstices with pronounced microreticulation and rather matt. Eyes distinctly convex and nearly as long as postocular region in dorsal view. Antenna approximately 0.9 mm long; antennomere IV approximately as long as broad or weakly oblong; antennomeres V-X weakly transverse and gradually, weakly increasing in width, X less than 1.5 times as broad as long. Mandibles ( Fig. 11 ) with a very weakly pronounced molar tooth. Ligula as in Fig. 12 .

Pronotum approximately 1.2 times as broad as long and 1.2 times as broad as head, broadest approximately in the middle; punctation and microsculpture similar to those of head.

Elytra approximately as long as, or slightly longer than pronotum; punctation dense, much more distinct than that of head and pronotum; interstices with shallow microsculpture. Hind wings fully developed. Metatarsomere I approximately as long as the combined length of metatarsomeres III and IV.

Abdomen narrower than elytra; tergites III-V with shallow anterior impressions, tergite VI without anterior impression; punctation fine, moderately dense on anterior tergites, somewhat sparser on tergite VII; interstices with very shallow microreticulation and glossy; posterior margin of tergite VII with palisade fringe; posterior margin of tergite VIII truncate or weakly convex in the middle ( Fig. 13 ).

♂: posterior margin of sternite VIII strongly convex ( Fig. 14 ); median lobe of aedeagus ( Figs 15-18 ) 0.36-0.38 mm long and slender; ventral process smoothly curved in lateral view.

♀: sternite VIII with convex posterior margin ( Fig. 19 ); spermatheca ( Figs 20-21 ) with long and nearly straight proximal portion.

C o m p a r a t i v e n o t e s: Drepasiagonusa tibetica is distinguished from D. smetanai based on external characters alone: smaller body size, different habitus (proportions of head, pronotum, and elytra), a smaller head (in relation to pronotum), the shape of the pronotum, finer punctation of the head, pronotum, and abdomen, darker coloration of the elytra, legs, and antennae, and a shorter metatarsomere I. For illustrations of the primary sexual characters and the habitus of D. smetanai see Figs 4-5 and PACE (2012), respectively.

D i s t r i b u t i o n a n d n a t u r a l h i s t o r y: The type specimens were collected in three geographically close localities to the south and southeast of Zhongdian, Northwest Yunnan, China. The altitudes range from 3540 to nearly 3900 m.

Figures

Figs 10-21: Drepasiagonusa tibetica: habitus (10); left mandible (11); ligula (12); male tergite VIII (13); male sternite VIII (14); median lobe of aedeagus in lateral view (15-17); apical portion of median lobe in ventral view (18); female sternite VIII (19); spermatheca (20-21). Scale bars: 10: 1.0 mm; 13-14, 19: 0.2 mm; 11, 15-18, 20-21: 0.1 mm; 12: 0.05 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.