Rugilus (Rugilus) emeimontis, Assing, 2015

Assing, Volker, 2015, A revision of Palaearctic and Oriental Rugilus. V. Two new species from China and additional records (Coleoptera: Staphylinidae: Paederinae), Linzer biologische Beiträge 47 (1), pp. 73-82 : 76-77

Rugilus (Rugilus) emeimontis nov.sp. ( Figs 1-5 )

T y p e m a t e r i a l: Holotype 3: "P. R. CHINA, Sichuan, Emei Shan, N28°33'04'' E103°21'19'', 25.v.2011, 1729 m, sift05, V. Grebennikov / Holotypus 3 Rugilus emeimontis sp. n., det. V. Assing 2014 " ( CAS).

E t y m o l o g y: The specific epithet is a noun composed of the name of the mountain where the species was discovered and the genitive of the Latin noun mons (mountain).

D e s c r i p t i o n: Body length 5.7 mm; length of forebody 3.4 mm. Coloration: head, pronotum, and abdomen blackish; elytra blackish with distinct bronze hue; legs dark-yellowish; antennae yellowish-red.

Head ( Fig. 2 ) weakly transverse, 1.03 times as broad as long, broadest across eyes; margins behind eyes smoothly and weakly curving towards posterior constriction in dorsal view, posterior angles obsolete; punctation coarse, largely longitudinally confluent (particularly in lateral dorsal portions). Eyes large and strongly convex, approximately as long as distance from posterior margin of eye to posterior constriction. Anterior margin of labrum with two short teeth on either side of the shallow median incision.

Pronotum ( Fig. 2 ) 1.17 times as long as broad and 0.75 times as wide as head; midline with pronounced broad impunctate glossy band in the middle, extending to neither anterior nor posterior margins; punctation similar to that of head.

Elytra ( Fig. 1 ) probably sexually dimorphic, with dense, coarse, and defined punctation; interstices glossy. Metatarsomere I nearly as long as the combined length of II and III.

Abdomen without microsculpture; anterior impressions of tergites III-VI with coarse and dense punctation; punctation of remaining tergal surfaces fine and dense; interstices without microsculpture; posterior margin of tergite VII with palisade fringe.

3: sternite VII ( Fig. 3 ) moderately strongly transverse, approximately 1.55 times as broad as long, with shallow postero-median impression, posterior margin weakly concave; sternite VIII ( Fig. 4 ) approximately 1.1 times as broad as long, posterior excision V-shaped and approximately one-fourth as deep as length of sternite; aedeagus with slender ventral process, 0.75 mm long, and shaped as in Fig. 5 .

♀: unknown.

C o m p a r a t i v e n o t e s: Based on the similar external and male sexual characters, R. emeimontis is probably allied to R. gansuensis ROUGEMONT, 1998 (Gansu, Shaanxi: Qinling Shan, Daba Shan, Maiji Shan) and R. daxuensis ASSING, 2012 (West Sichuan: Daxue Shan). It is distinguished from these species particularly by the differently shaped aedeagus and by the differently shaped posterior excision of the male sternite VIII (less deep than in R. gansuensis and deeper than in R. daxuensis ).

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: Rugilus emeimontis is the third (probably) endemic Rugilus species to be recorded from the Emei Shan in West Sichuan. The holotype was sifted at an altitude of approximately 1730 m, together with a specimen of R. aquilinus . Although females are unknown, it can be assumed that, like other closely allied species known from China, R. emeimontis is subject to a sexual wingdimorphism (males macropterous, females micropterous).

Figures

Figs 1-5: Rugilus emeimontis nov.sp.: (1) forebody; (2) head and pronotum; (3) male sternite VII; (4) male sternite VIII; (5) aedeagus in lateral view. Scale bars: 1-2: 1.0 mm; 3-5: 0.5 mm.