Drepasiagonusa procera, 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 : 83-84

Drepasiagonusa procera nov.sp. ( Figs 6-9 , 37-39 )

T y p e m a t e r i a l: Holotype ♀: " CHINA: Yunnan, Nujiang Lisu Pref., Gaoligong Shan, W " Cloud pass", 24 km NW Liuku, 25°59'00''N, 98°40'14''E, 2907 m, small waterfall, wet moss sifted, 3.IX.2009, leg. M. Schülke [CH09-23] / Holotypus ♀ Drepasiagonusa procera sp.n., det. V. Assing 2018" (MNB).

E t y m o l o g y: The specific epithet (Latin, adjective: slender) alludes to the distinctive habitus of this species.

D e s c r i p t i o n: Body length 4.2 mm; length of forebody 2.0 mm. Habitus as in Fig. 6 . Coloration: forebody reddish; abdomen reddish with most of tergite VI, the anterior two-thirds of tergite VII, and an antero-median spot on tergite III-V blackish; legs, antennae, and maxillary palpi reddish.

Head ( Figs 7 , 37 ) approximately as long as broad; punctation shallow, rather large, and extremely dense (except on frons), with the interstices reduced to narrow ridges; microsculpture pronounced. Eyes moderately convex and small, little more than half as long as distance from posterior margin of eye to posterior constriction of head. Antenna ( Fig. 8 ) 1.3 mm long and very slender; antennomeres IV approximately twice as long as broad, V-X of gradually decreasing length and decreasingly oblong, X weakly oblong, and XI approximately as long as the combined length of IX and X. Mandibles ( Fig. 37 ) each with a pronounced, long and acute molar tooth.

Pronotum ( Fig. 7 ) weakly transverse, 1.08 times as broad as long and approximately as broad as head, broadest in the middle; lateral margins distinctly convex in the middle and sinuate near posterior angles (dorsal view); punctation and microsculpture similar to those of head, but punctures even shallower and less defined.

Elytra ( Fig. 7 ) 0.85 times as long as pronotum; punctation extremely dense, moderately fine, and defined. Hind wings not examined. Metatarsomere I approximately as long as the combined length of metatarsomeres III and IV.

Abdomen ( Fig. 9 ) as broad as elytra; tergites III-V with moderately deep anterior impressions, tergite VI without anterior impression; punctation fine and dense, only slightly sparser on tergite VII than on anterior tergites; interstices with distinct microreticulation; posterior margin of tergite VII with palisade fringe; posterior margin of tergite VIII weakly convex.

♂: unknown.

♀: posterior margin of sternite VIII obtusely produced in the middle ( Fig. 38 ); spermatheca shaped as in Fig. 39.

C o m p a r a t i v e n o t e s: Drepasiagonusa procera is readily distinguished from all other species of the genus by its conspicuous external characters alone: relatively large body size; slender habitus; a reddish forebody; long and very slender antennae with oblong antennomeres IV-X; small eyes; short elytra.

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 locality is situated near Gongshan in the Gaoligong Shan, Northwest Yunnan. The holotype was sifted from wet moss near a small waterfall at an altitude of approximately 2900 m.

Figures

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.

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.