Chinecallicerus grandicollis, Assing, 2018

Assing, Volker, 2018, Six new species of Chinecallicerus from China, with a new synonymy (Coleoptera: Staphylinidae: Aleocharinae: Geostibini), Linzer biologische Beiträge 50 (1), pp. 47-63 : 60-61

Chinecallicerus grandicollis nov.sp. ( Figs 26-32 , Map 1 )

T y p e m a t e r i a l: Holotype ♀: " CHINA - Yunnan, Gaoligong Shan, pass SW Baoshan, 4.- 6.VI.2006 Jeniš / Holotypus ♀ Chinecallicerus grandicollis sp.n., det. V. Assing 2018" (cAss).

E t y m o l o g y: The specific epithet (adjective) alludes to the relatively large pronotum.

D e s c r i p t i o n: Body length 4.3 mm; length of forebody 2.1 mm. Habitus as in Fig. 26 . Coloration: head blackish; pronotum and elytra brown; abdomen dark-brown with the posterior margins of the segments broadly yellowish-red; legs dark-yellowish; antennae dark-brown with the basal two antennomeres slightly paler; maxillary palpi brown with the apical palpomere pale-yellowish.

Head ( Fig. 27 ) distinctly transverse, 1.12 times as broad as long; posterior angles weakly marked; punctation rather sparse and extremely fine, visible only at high magnification; interstices with shallow, but distinct microsculpture. Eyes moderately convex and approximately as long as postocular region in dorsal view. Antenna ( Fig. 28 ) 1.65 mm long and massive; antennomeres IV distinctly transverse, V-IX weakly transverse, X approximately as long as broad, and XI approximately as long as the combined length of IX and X.

Pronotum ( Fig. 27 ) distinctly transverse and large in relation to head, approximately 1.2 times as broad as long and nearly 1.4 times as broad as head, broadest approximately in the middle; disc very weakly convex in cross-section; punctation dense and extremely fine; microsculpture very shallow.

Elytra ( Fig. 27 ) slightly shorter than pronotum; punctation very dense and fine, but more distinct than that of head and pronotum; interstices with shallow microsculpture. Hind wings fully developed.

Abdomen ( Fig. 29 ) narrower than elytra; tergites III-V with shallow anterior impressions; anterior portions of tergites III-V with very fine scattered punctation; remainder of tergites III-VI with moderately dense and fine punctation; tergite VII with sparse punctation; interstices with extremely fine and shallow transverse microsculpture visible only at high magnification; posterior margin of tergite VII with palisade fringe.

♂: unknown. ♀: posterior margin of tergite VIII broadly and weakly convex ( Fig. 30 ) ; posterior margin of sternite VIII weakly convex, in the middle indistinctly concave ( Fig. 31 ); spermatheca ( Fig. 32 ) with truncate distal portion and very short proximal portion.

C o m p a r a t i v e n o t e s: This species is distinguished from all its congeners by the combination of a large (in relation to head), distinctly transverse, and weakly convex (cross-section) pronotum with very fine punctation, massive antennae, very fine and scattered punctation of the anterior portions of tergites III-VII, and by the distinctive shape of the spermatheca.

D i s t r i b u t i o n: The type locality is situated in the Gaoligong Shan in the northwest of Yunnan province, China ( Map 1 ). Additional data are not available.

Figures

Map 1: Distributions of Chinecallicerus species in China: C. wrasei (black diamond); C. schuelkei (white circle); C. laevigatus and C. serratus (both black circle); C. subater (white diamond); C. reticulatus (black star); C. pinnatus (black triangle); C. grandicollis (grey star); C. carinatus (white triangle); C. orbiculatus (white star); C. transversus (black square); C. granulosissimus (white square); C. trituberculatus (grey triangle).

Figs 24-32: Chinecallicerus granulosissimus (24-25) and C. grandicollis (26-32): antero-median portion of head (24); postero-lateral portion of abdomen (25); habitus (26); forebody (27); antenna (28); abdomen (29); female tergite VIII (30); female sternite VIII (31); spermatheca (32). Scale bars: 26-27: 1.0 mm; 28-29: 0.5 mm; 30-31: 0.2 mm; 24-25, 32: 0.1 mm.