Orphnebius dishamatus, 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: 110-111

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Orphnebius dishamatus


Orphnebius dishamatus   nov.sp. ( Figs 9-15 View Figs 9-15 )

T y p e m a t e r i a l: Holotype 3: " CHINA [12a] - Yunnan, mt. WNW Wuding , mix. forest, 25°38'45''N, 102°06'55''E, 2390 m, 1.IX.2014, V. Assing / Holotypus 3 Orphnebius dishamatus   sp. n., det. V. Assing 2015" (cAss). GoogleMaps  

E t y m o l o g y: The specific epithet (adjective) is composed of the Latin prefix dis- (un-) and an adjective derived from the Latin noun hamus (hook). It alludes to the straight apex of the ventral process of the aedeagus (lateral view).

D e s c r i p t i o n: Body length 4.5 mm; length of forebody 1.7 mm. Coloration: forebody black; abdomen yellowish-red, strongly contrasting with the forebody; legs with dark-brown femora, reddish-brown tibiae, and dark-yellowish tarsi; antennae with antennomeres I-IV pale-reddish, V reddish-brown, and VI-XI blackish.

Head ( Fig. 9 View Figs 9-15 ) approximately 1.3 times as broad as long; punctation fine and sparse. Eyes large and bulging, distinctly longer than distance from posterior margin of eye to posterior constriction in dorsal view. Antenna ( Fig. 10 View Figs 9-15 ) 1.0 mm long, nearly symmetric; antennomeres IV moderately transverse and V-X distinctly transverse, of gradually increasing width; X approximately twice as broad as long; XI distinctly elongated, approximately as long as VIII-X combined.

Pronotum ( Fig. 9 View Figs 9-15 ) transverse, 1.35 times as broad as long and 1.25 times as broad as head, broadest slightly behind middle, more strongly narrowed anteriorly than posteriorly; lateral margins weakly convex in dorsal view; posterior angles moderately marked; disc with very sparse, minute punctures with long greyish setae; microsculpture absent; lateral margins each with three long black setae of nearly half the length of lateral margin, one in anterior angle, one in anterior half, and one in posterior half.

Elytra ( Fig. 9 View Figs 9-15 ) slightly shorter, and at posterior margin much broader than pronotum; punctation fine and sparse; pubescence long, sparse, and suberect. Hind wings present.

Abdomen ( Fig. 11 View Figs 9-15 ) 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 and moderately dense non-setiferous punctures and with irregular striate sculpture in posterior three-fourths; posterior margin of tergite VII with pronounced palisade fringe.

3: tergite VIII posteriorly with two transverse rows of black setae, a submarginal row composed of eight long setae and a marginal row composed of ten shorter setae; sclerites of segments IX and X modified, with dense and moderately long pubescence; median lobe of aedeagus ( Figs 12-13 View Figs 9-15 ) 0.7 mm long; ventral process short, apically straight and acute (not hooked) in lateral view, and of triangular shape in ventral view; crista apicalis rather pronounced; paramere ( Fig. 14 View Figs 9-15 ) 0.6 mm long; paramerite slightly longer than condylite and with four setae at base of velum ( Fig. 15 View Figs 9-15 ).

♀: unknown.

C o m p a r a t i v e n o t e s: Based on external characters and particularly on the synapomorphic modifications of segments IX-X and of the aedeagus (shape and internal structures of the median lobe; structure of the parameres), O. dishamatus   undoubtedly belongs to the O. hauseri   group. Among the species of this group, it is most similar to O. scissus   (Yunnan), from which it differs particularly by the morphology of the antennae ( O. scissus   : distinctly asymmetric and longer, approximately 1.2 mm long), the less dense non-setiferous punctures on the abdominal tergite VII, and by the morphology of the median lobe of the aedeagus ( O. scissus   : 0.75 mm long; apex of ventral process weakly hooked in lateral view; crista apicalis smaller and much more oblique) and of the parameres ( O. scissus   : condylite much shorter, and much shorter than paramerite; paramerite of different shape). For illustrations of O. scissus   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 near Wuding in East Yunnan. The holotype was sifted from leaf litter in a mixed forest margin with alder and pine at an altitude of 2390 m.