Orphnebius incrassatus, Assing, 2015

Assing, Volker, 2015, On the Orphnebius fauna of the East Palaearctic region. VI. Six new species from China and Taiwan, and additional records (Coleoptera: Staphylinidae: Aleocharinae: Lomechusini), Linzer biologische Beiträge 47 (1), pp. 101-125: 114-115

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Orphnebius incrassatus


Orphnebius incrassatus   nov.sp. ( Figs 22-25 View Figs 22-27 )

T y p e m a t e r i a l: Holotype ♀: " CHINA: Yunnan, Baoshan Pref., Gaoligong Shan , 33 km SE Tengchong, 2150 m, 24°51'22''N, 98°45'36''E, devast. primery [sic] deciduous forest, litter, wood, mushrooms sifted, 26.VIII.2009, leg. M. Schülke [CH09-08] / Holotypus ♀ Orphnebius incrassatus   sp. n., det. V. Assing 2015" (cAss). GoogleMaps  

E t y m o l o g y: The specific epithet (Latin, adjective) alludes to the conspicuously incrassate antennae.

D e s c r i p t i o n: Body length 4.0 mm; length of forebody 1.6 mm. Coloration: forebody black; abdomen yellowish-red, strongly contrasting with the forebody; legs dark-brown with paler tarsi; antennae with antennomeres I-III dark-brown and antennomeres IV-XI blackish.

Head ( Fig. 22 View Figs 22-27 ) 1.25 times as broad as long; distinctly angled posteriorly in lateral view, i.e., dorsal surface meeting with posterior surface at a sharp angle; punctation of dorsal surface extremely fine and sparse. Eyes large and bulging, nearly reaching posterior margin in dorsal view. Antenna ( Fig. 23 View Figs 22-27 ) 1.0 mm long, strongly incrassate; antennomeres IV moderately transverse; V-X strongly transverse, approximately twice as broad as long, of gradually increasing width; XI distinctly elongated, approximately as long as VIII-X combined.

Pronotum ( Fig. 22 View Figs 22-27 ) strongly transverse, nearly 1.5 times as broad as long and 1.45 times as broad as head, broadest approximately in the middle; lateral margins strongly convex in dorsal view; posterior angles obsolete, broadly convex; disc nearly impunctate, only with scattered minute setiferous punctures; microsculpture absent; lateral margins each with few moderately long brownish setae.

Elytra ( Fig. 22 View Figs 22-27 ) slightly shorter, and at posterior margin much broader than pronotum; punctation fine and sparse; pubescence whitish, sparse, and suberect. Hind wings present.

Abdomen ( Fig. 24 View Figs 22-27 ) broad and wedge-shaped, widest at base; tergites III-VI with sharp and pronounced paratergites gradually decreasing in height; tergites III-VI impunctate except for some minute punctures at posterior margins; tergite VII with rather coarse, oblong, and moderately dense non-setiferous punctures in posterior two-thirds; posterior margin of tergite VII with pronounced palisade fringe.

3: unknown.

♀: tergite VIII posteriorly approximately 20 fine dark setae posteriorly, posterior margin broadly and strongly convex; sternite VIII with broadly and strongly convex posterior margin; sclerites of segments IX and X modified, with dense and moderately long pubescence; spermatheca ( Fig. 25 View Figs 22-27 ) of distinctive shape.

C o m m e n t: This species is described exclusively based on a female because the external characters and the shape of the spermatheca are most likely highly distinctive.

C o m p a r a t i v e n o t e s: Based on the modified abdominal segments IX-X, O. incrassatus   belongs to the O. hauseri   group sensu lato. It is distinguished from the species of the O. hauseri   group sensu strictu by the strongly transverse pronotum and the shape of the spermatheca. As can be inferred from external characters (head posteriorly angled in lateral view; pronotum strongly transverse and with obsolete posterior angles; chaetotaxy of the abdomen) and the shape of the spermatheca, O. incrassatus   is most closely allied to the geographically close O. truncus ASSING, 2009   , from which it differs particularly by the conspicuously incrassate antennae, the darker coloration of the legs and the antennae, and by the shape of the spermatheca. For illustrations of O. truncus   see ASSING (2009).

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: The type locality is situated in the Gaoligong Shan in western Yunnan. The holotype was sifted from leaf litter in a degraded primary forest at an altitude of 2150 m.