Rugilus (Rugilus) bisinuosus, Assing, 2014

Assing, V., 2014, A revision of Palaearctic and Oriental Rugilus. IV. Three new species from Nepal and additional records (Coleoptera: Staphylinidae: Paederinae), Linzer biologische Beiträge 46 (1), pp. 449-459 : 455-457

Rugilus (Rugilus) bisinuosus nov.sp.

( Figs 15-19 )

Type material Holotype: " NEPAL, Manaslu Mts. , SE slope , W Gupchi Danda, 2500-2800 m, 19./ 20.V.2006, leg. J. Schmidt, 28°08'59N, 84°46'06E / Holotypus Rugilus bisinuosus sp.n., det. V. Assing 2013" ( NME) . Paratype: same data as holotype ( cAss).

Etymology: The specific epithet (Latin, adjective) alludes to the bisinuate ventral process of the aedeagus in lateral view.

Description: Body length 5.7-6.1 mm; length of forebody 3.2-3.3 mm. Habitus as in Fig. 15 . Coloration: body blackish; elytra with weak bronze hue; legs and antennae reddish, with the apical portions of the femora and antennomere I somewhat infuscate.

Head ( Fig. 16 ) 1.04-1.07 times as broad as long, broadest across eyes; margins behind eyes smoothly curving towards posterior constriction in dorsal view, posterior angles obsolete; punctation moderately coarse, umbilicate, largely longitudinally confluent, and very dense; interstices reduced to very narrow ridges. Eyes large and strongly convex, approximately 0.8-0.9 times as long as distance from posterior margin of eyes to posterior constriction. Anterior margin of labrum with two pronounced, basally fused teeth on either side of the narrow median incision.

Pronotum ( Fig. 16 ) weakly oblong, approximately 1.1 times as long as broad and approximately 0.75 times as wide as head; midline with short impunctate, glossy band in posterior half; punctation similar to that of head.

Elytra ( Fig. 16 ) short, approximately 0.75 times as long as pronotum; humeral angles practically obsolete; punctation dense; interstices glossy. Hind wings completely reduced. Legs long and slender; metatarsomere I slightly longer than the combined length of II and III.

Abdomen 1.15-1.20 times as broad as elytra; tergites III-VI with shallow impressions anteriorly, these impressions with moderately coarse and dense punctation; punctation of remaining tergal surfaces fine and moderately dense; interstices of tergites III-VI with very shallow, those of tergite V with more distinct microreticulation; posterior margin of tergite VII without palisade fringe.

: sternite VII ( Fig. 17 ) strongly transverse and with unmodified pubescence, posterior margin with distinct median excision; sternite VIII ( Fig. 18 ) weakly transverse, approximately 1.05 times as broad as long, posterior excision narrowly V-shaped, approximately 0.3 times as deep as length of sternite; aedeagus ( Fig. 19 ) approximately 1.1 mm long; ventral process conspicuously slender, bisinuate in lateral view, and apically very acute.

Comparative notes: Rugilus bisinuosus is characterized particularly by the distinctive shape of the morphology of the ventral process of the aedeagus and by the shape of the male sternite VII. It is additionally distinguished from R. manasluensis and R. schmidti , the only other locally endemic consubgeners known from the Manaslu range, by the less oblong pronotum, the strongly confluent punctation of the head and pronotum, and by the less transverse male sternite VIII with a much narrower posterior excision.

Distribution and natural history: The type locality is situated in the southeastern Manaslu range at an altitude of 2500-2800 m. It can be inferred from the restricted distributions of other micropterous consubgeners known from Nepal that R. bisinuosus is probably locally endemic in this region.

Figures

Figs 15-19: Rugilus bisinuosus nov.sp.: (15) habitus; (16) forebody; (17) male sternite VII; (18) male sternite VIII; (19) aedeagus in lateral view. Scale bars: 15-16: 1.0 mm; 17-18: 0.5 mm; 19: 0.2 mm.