Chinecallicerus glabriventris, Assing, 2019

Assing, Volker, 2019, Five new species oI Chinecallicerus Irom China (Coleoptera, Staphylinidae, Aleocharinae, Geostibini), Linzer biologische Beiträge 51 (1), pp. 285-302 : 290-296

Chinecallicerus glabriventris nov.sp. ( Figs 8-16 , Map 1 )

T

y p e m a t e r i a l: Holotype ♂:̎ China:YunnanProv., Gaoligong Mts NNR, 1.0- 1.1 km SE of Konshu vill., 25°43.10-16'N, 98°38.31-35'E, J. Hảjek & J. Růžička leg. / Ch21, 23) 30.vi.2016; 2180-2240 m, sift ♂ 16, broad-leaved forest, wet debris under bamboo in narrow valley near brook / Holotypus ♂ Chinecallicerus glabriventris sp. n., det. V. Assing 2018 ̎ ( NMP) .

E t y m o l o g y: The specific epithet (Latin, adjective) alludes to conspicuously sparsely punctate and very glossy abdomen.

D e s c r i p t i o n: Body length 5.7 mm; length of forebody 2.5 mm. Habitus as in Fig. 8 . Coloration: head black; pronotum and elytra dark-brown; abdomen black with the posterior margins of tergites III-VII and the posterior portion of tergite VIII reddish; legs reddish with paler tarsi; antennae blackish with antennomeres I reddish-brown and II-III dark-brown; maxillary palpi brown with the apical palpomere pale-yellowish.

Head ( Fig. 11 ) moderately transverse, approximately 1.1 times as broad as long; posteri- or angles obsolete, i.e., head gradually tapering behind eyes in dorsal view; punctation dense and fine, but distinct ( Fig. 9 ); interstices without microsculpture and glossy. Eyes distinctly convex and large, approximately as long as distance from posterior margin of eye to posterior constriction of head in dorsal view. Antenna ( Fig. 10 ) 1.9 mm long and slender; antennomeres IV nearly twice as long as broad, V-X of gradually decreasing length and decreasingly oblong, X weakly oblong, and XI barely as long as the combined length of IX and X. Maxillary palpomere III weakly dilated.

Pronotum ( Fig. 11 ) 1.08 times as broad as long and 1.3 times as broad as head, broadest in posterior half; disc moderately convex in cross-section; posterior margin smoothly convex; punctation dense, fine, and defined; interstices without microsculpture.

Elytra ( Fig. 11 ) slightly longer than pronotum; punctation very dense, coarser than that of pronotum, and somewhat asperate; interstices without microsculpture. Hind wings fully developed.

Abdomen ( Fig. 12 ) narrower than elytra and very glossy; tergites III-VI with impunctate anterior impressions ( Fig. 13 ), those of tergites III-V moderately deep and that of tergite VI shallow; remainder of tergal surfaces with conspicuously sparse punctation ( Fig. 14 ); microsculpture completely absent; posterior margin of tergite VII with palisade fringe.

♂: tergite III with pronounced and apically acute median tubercle ( Figs 12-13 ), other tergites unmodified; posterior margin of tergite VIII indistinctly pointed in the middle; posterior margin of sternite VIII convex; median lobe of aedeagus 0.54 mm long and shaped as in Figs 15-16 .

♀: unknown.

C o m p a r a t i v e n o t e s: The only other described species with a similarly sparsely punctate abdomen is C. wrasei ASSING, 2006 from Northwest Yunnan ( Map 1 ), with which C. glabriventris additionally shares a similar habitus and similar punctation of the forebody. The new species is distinguished from C. wrasei by smaller body size (C. wrasei: length of forebody 2.9 mm), much more slender antennae with distinctly oblong antennomeres IV-X (C. wrasei: antennomeres VI-X approximately as long as broad or weakly transverse), denser and finer punctation of the pronotum and the elytra, unmodified male tergites IV and VII (distinctly modified in C. wrasei), and a much smaller aedeagus (C. wrasei: median lobe of aedeagus 0.68 mm long). For illustrations of C. wrasei see ASSING (2006).

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: Thetypelocalityissituated in the Gaoligong Shan, West Yunnan, China ( Map 1 ). The holotype was sifted from wet debris near a stream in a broadleaved forest at an altitude of 2180-2240 m.

Figures

Map 1: Distributions of Chinecallicerus species in China: C. granulosissimus (white circle); C. formidabilis (black circle); C. wrasei (white star); C. glabriventris (black star); C. reuteri (white triangle); C. feldmanni (white triangle); C. discrepans (black triangle).

Figs 8-16: Chinecallicerus glabriventris: habitus (8); median dorsal portion of head (9); antenna (10); forebody (11); male abdomen (12); anterior portion of male abdomen in dorso-lateral view (13); median portion of tergite VI (14); median lobe of aedeagus in lateral and in ventral view (15- 16). Scale bars: 8: 1.0 mm; 10-13: 0.5 mm; 15-16: 0.2 mm; 9, 14: 0.1 mm.