Habrocerus bisetosus, Assing, 2014

Assing, V., 2014, A revision of the Habrocerinae of the world. V. A new species of Habrocerus from China and additional records (Coleoptera: Staphylinidae), Linzer biologische Beiträge 46 (2), pp. 1217-1227 : 1221-1223

Habrocerus bisetosus nov.sp. ( Figs 1-6 , Map 1 )

T y p e m a t e r i a l: Holotype: " CHINA [4a] - S-Gansu, N Chengxian, W-Qinling Shan, 34°08'16''N, 105°46'42''E, 1760 m, 28.VII.2012, V. Assing / Holotypus Habrocerus bisetosus sp.n. det. V. Assing 2014" (cAss).

E t y m o l o g y: The specific epithet (Latin, adjective) alludes to the presence of two long setae on each of the appendices of pleurite VIII.

D e s c r i p t i o n: Length of forebody 2.1 mm. Elytra yellowish-brown, noticeably paler than the blackish head and pronotum. Head and pronotum without trace of microsculpture; elytra with transverse microsculpture. Other external characters as in H. capillaricornis .

: tergite VII ( Fig. 1 ) and sternite VII ( Fig. 2 ) with noticeably concave posterior margins; sternite VIII ( Figs 3-4 ) posteriorly with a deep U-shaped excision; appendices of pleurites VIII at base and in the middle distinctly dilated, each with two long setae ( Fig. 3 ); tergite VIII laterally with two conspicuous processes on either side ( Fig. 3 ); sclerites of segment IX as in Figs 5-6 .

: unknown. C o m m e n t: The internal sac of the aedeagus was lost in the process of dissecting the genitalia. However, the species differs from its congeners by so many and so distinctive male secondary sexual characters that a description of this species seems justified.

C o m p a r a t i v e n o t e s: Based on the modifications of the male sexual characters, H. bisetosus belongs to the H. capillaricornis group. For characters constituting this group and distinguishing it from the H. schwarzi group see ASSING & WUNDERLE (1995). The new species is readily distinguished from all other representatives of the H. capillaricornis group, including H. splendens and H. indicus , by the shape of the posterior emargination of the male sternite VIII, by the conspicuous lateral processes of the male tergite VIII, and by the shapes of the appendices of the male pleurites VIII, from many of them (including H. splendens and H. indicus ) also by the presence of two long setae on each of the male pleurites VIII. For illustrations of the male sexual characters of the representatives of the H. capillaricornis group see ASSING & WUNDERLE (1995, 1996) and ASSING (2008).

D i s t r i b u t i o n a n d b i o n o m i c s: The type locality is situated in the western Qinling Shan to the north of Chengxian. The holotype was sifted from a heap of rotting bamboo at a forest margin at an altitude of 1760 m.

Figures

Map 1: Distribution of Habrocerus in China: H. bisetosus (star); H. schuelkei (diamond); H. splendens (black circles); H. indicus (white circle).

Figs 1-6: Habrocerus bisetosus nov.sp.: (1) male tergite VII; (2) male sternite VII; (3) male sternite VIII and pleurites VIII in ventral view; (4) posterior portion of male sternite VIII; (5-6) male segment IX in ventral and in lateral view. Scale bars: 1-3, 5-6: 0.5 mm; 4: 0.2 mm.