Chinecallicerus discrepans, Assing, 2019

Assing, Volker, 2019, Five new species oI Chinecallicerus Irom China (Coleoptera, Staphylinidae, Aleocharinae, Geostibini), Linzer biologische Beiträge 51 (1), pp. 285-302 : 300-301

Chinecallicerus discrepans nov.sp. ( Figs 30-38 , Map 1 )

T

y p e m a t e r i a l: Holotype ♂: ̎ China, Sichuan, NW Heishui, 3428 m, 32°11'29''N, 102°39'30''E, 14-20.VI.2018, leg. Reuter / Holotypus ♂ Chinecallicerus discrepans sp. n., det. V. Assing 2018̎ (cAss).

E t y m o l o g y: The specific epithet is the present participle of the Latin verb discrepare (to differ) and alludes to the number and nature of the characters distinguishing this species from its congeners.

D e s c r i p t i o n: Body length 6.1 mm; length of forebody 2.6 mm. Habitus as in Fig. 30 , together with the matt head and pronotum somewhat reminding of (the much smaller) Dinaraea angustula (GYLLENHAL, 1810). Coloration: head and pronotum blackish; elytra blackish-brown with the postero-lateral portions extensively, diffusely paler; abdomen blackish with the posterior margin of tergite VII and tergite VIII reddish; legs reddish-brown with slightly darker meso- and metafemora; antennae reddish-brown with blackish antennomeres I and II; maxillary palpi blackish-brown with the apex of palpomere III paler and with palpomere IV yellow.

Head ( Fig. 31 ) distinctly transverse, 1.15 times as broad as long, broadest behind eyes; lateral margins behind eyes convex in dorsal view; dorsal surface flat and matt; punctation dense and fine, indistinct in the pronounced microreticulation. Eyes relatively small and moderately convex, shorter than distance from posterior margin of eye to posterior constriction of head in dorsal view. Antenna ( Fig. 32 ) moderately long (length 2.15 mm) and slender; antennomeres IV weakly oblong, V slightly longer and more oblong than IV and VI (approximately 1.5 times as long as broad), V-X of subequal width and of gradually decreasing length, V-VI weakly oblong, VII-X as long as broad or weakly transverse, and XI slender and elongate, longer than the combined length of IX and X. Maxillary palpomere III rather slender, approximately four times as long as broad. Labium as in Fig. 33 .

Pronotum ( Fig. 31 ) 1.18 times as broad as long and 1.21 times as broad as head, weakly convex in cross-section, with median portion of disc shallowly impressed in posteromedian portion; lateral margins convex; posterior angles moderately marked; punctation and microsculpture similar to those of head.

Elytra ( Fig. 31 ) approximately as long as pronotum; punctation and microsculpture similar to those of pronotum. Hind wings fully developed. Legs moderately slender; length of metatibia 1.0 mm.

Abdomen ( Fig. 34 ) narrower than elytra; tergites III-VI with rather deep and broad anterior impressions, these impressions with a punctate patch in the middle and impunctate in lateral portions; tergite VII anteriorly with a shallow impunctate transverse impression; punctation of remainder of tergal surfaces III-VI rather coarse and dense, that of tergite VII fine and rather sparse; microsculpture extremely shallow, visible only at high magnification (100 x), and composed of transverse meshes; posterior margin of tergite VII with palisade fringe.

♂: tergite VII with pronounced, distinctly elevated, erect, and apically acute spineshaped tubercle ( Figs 37-38 ); posterior margin of tergite VIII of very distinctive shape, concave and laterally with three teeth on either side ( Figs 37-38 ); median lobe of aedeagus nearly 0.7 mm long and shaped as in Figs 35-36 .

♀: unknown.

C o m p a r a t i v e n o t e s: This conspicuous species is characterized particularly by the practically completely matt forebody, relatively small eyes, a flat pronotum, the presence of anterior impressions on tergite VI and even on tergite VII, the punctation pattern of the anterior impressions of tergites III-VI, the distinctive modifications of the male tergites VII and VIII, and by the shape of the aedeagus.

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 North Sichuan ( Map 1 ). The holotype was collected with pitfall traps in a young moist secondary forest at an altitude of approximately 3430 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 30-36: Chinecallicerus discrepans: habitus (30); forebody (31); antenna (32); labium (33); male abdomen (34); median lobe of aedeagus in lateral and in ventral view (35-36). Scale bars: 30- 32, 34: 1.0 mm; 35-36: 0.2 mm; 33: 0.1 mm.

Figs 37-38: Chinecallicerus discrepans: tergites VII and VIII of male abdomen (37); segments VII and VIII of male abdomen in dorso-lateral view (38). Scale bars: 0.5 mm.