Drepasiagonusa tibetica Assing 2018, nov.sp.
Creators: name: Assing, Volker
Publisher: name: Zenodo
Year: 2018
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Staphylinidae
Drepasiagonusa
Drepasiagonusa tibetica

description: 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.
description: Published as part of Assing, Volker, 2018, New species and additional records of Cephalocousya and Drepasiagonusa from China and Russia (Coleoptera: Staphylinidae: Aleocharinae: Oxypodini), pp. 75-88 in Linzer biologische Beiträge 50 (1) on pages 84-85, DOI: 10.5281/zenodo.3985285