Orphnebius (Deroleptus) cultellatus, Assing, 2016

Assing, Volker, 2016, On some Lomechusini of the Palaearctic and Oriental regions (Coleoptera: Staphylinidae: Aleocharinae), Beiträge Zur Entomologie = Contributions to Entomology 66 (1), pp. 13-111 : 68-69

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https://doi.org/ 10.21248/contrib.entomol.66.1.13-111



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scientific name

Orphnebius (Deroleptus) cultellatus

sp. nov.

Orphnebius (Deroleptus) cultellatus View in CoL spec. nov.

( Figs 59 View Figs 54–83 , 86, 92–94 View Figs 84–101 , 325–334 View Figs 317–339 )

Type material: Holotype ♂: “ Thailand – Chiang Mai, Doi Suthep 890 m, Barber F. III.86. P. Schwendinger / Holotypus ♂ Orphnebius cultellatus sp. n., det. V. Assing 2015” ( MHNG).

Paratypes: 1 ♂, 2 ♀♀: same data as holotype ( MHNG, cAss) ; 1 ♂: same data as holotype, but “ 950 m IV.86 ” ( MHNG) ; 1 ♀: “ Thailand: Chiang Mai, Rd to Wab Pang An , 50 km NE Chiang Mai, 900 m, Burckhardt-Löbl, 3.XI.85 ” ( MHNG) ; 1 ♂, 1♀: “ Laos-N ( Louangphrabang ), 11–21.v.2002, 19°35'N, 101°58'E, Thong Khan , ~ 750 m, Vít Kubáň leg. / Collection Naturhistorisches Museum Basel” ( NHMB); GoogleMaps 1 ♀: “ Laos, Phongsaly prov., 21°21'N, 102°03'E, Ban Sano Mai, 19.–26.v.2004, ~ 1150 m, Vít Kubáň leg.” (cAss) GoogleMaps .

Etymology: The specific epithet is an adjective derived from the Latin noun cultellus (small knife) and alludes to the knife-shaped ventral process of the aedeagus.

Description: Body length 4.3–5.3 mm; length of forebody 1.7–2.1 mm. Coloration: forebody blackish-brown to black, with the humeral and sutural portions of the elytra usually reddish to reddish-brown; abdomen bicoloured with segments III–VI bright-reddish and VII–X blackish-brown to blackish; legs: femora dark-brown to blackish-brown, tibiae mostly reddish, meso- and metatibiae rarely dark-brown to blackish-brown, tarsi reddish to dark-reddish; antennae blackish-brown to black, with the basal four antennomeres usually more or less extensively reddish to brown; maxillary palpi dark-brown to blackish with the apical palpomere yellowish.

Head ( Fig. 86 View Figs 84–101 ) 1.15–1.19 times as broad as long; lateral dorsal portions with sparse and fine punctation; median dorsal portion extensively impunctate; dorsal surface without microsculpture. Eyes large and bulging, slightly to distinctly longer than the distance from posterior margin of eye to posterior constriction in dorsal view. Antenna ( Fig. 59 View Figs 54–83 ) 1.3–1.5 mm long; antennomere IV oblong and flattened; antennomere V weakly oblong and somewhat flattened; antennomeres VI–X of gradually increasing width and increasingly transverse, X slightly less than 1.5 times as broad as long, and XI slightly shorter than the combined length of VIII–X.

Pronotum ( Fig. 86 View Figs 84–101 ) 1.10–1.15 times as broad as long and slightly broader than head, strongly convex in crosssection; lateral margins straight and subparallel in dorsal view; disc with few scattered macropunctures and with sparse setiferous micropunctation.

Elytra ( Fig. 86 View Figs 84–101 ) approximately as long as pronotum; punctation fine and sparse; pubescence long, depressed to sub-erect; interstices without microsculpture. Hind wings fully developed. Legs long and slender; metatibia 0.85–1.05 mm long; metatarsomere I of variable length, as long as the combined length of II–III, or as long as the combined length of II–IV, or of intermediate length.

Abdomen ( Figs 92–94 View Figs 84–101 ) approximately as broad as (small specimens) or broader than elytra (large specimens); sternites III and IV with distinct postero-lateral processes of highly variable length, width, and shape; tergites III– VI with a lateral puncture on either side and with sparse fine punctures at posterior margins; tergite VII with dense, coarse, and circular non-setiferous punctures in anterior half and with irregular striae in posterior half, postero-median portion smooth, posterior margin with pronounced palisade fringe; tergite VIII ( Fig. 328 View Figs 317–339 ) with dense and coarse non-setiferous punctation, except for a narrow smooth impunctate median band, posteriorly with a pronounced excision and anterior to this excision with a more or less pronounced median tubercle; sternite VIII ( Figs 329–331 View Figs 317–339 ) sharply produced posteriorly, laterally with a comb of 3–4 setiferous tooth-shaped projections; tergite X ( Fig. 332 View Figs 317–339 ) with dense and long pubescence.

♂: sternite VIII ( Fig. 329 View Figs 317–339 ) without oblong folds; median lobe of aedeagus ( Figs 325–326 View Figs 317–339 ) approximately 0.55 mm long; ventral process laterally compressed, somewhat knife-shaped, and sharply edged ventrally; paramere ( Fig. 327 View Figs 317–339 ) 0.45 mm long, condylite with a large velum.

♀: sternite VIII ( Figs 330–331 View Figs 317–339 ) in postero-median portion with a pair of oblong folds; segment IX ( Fig. 332 View Figs 317–339 ) with sclerotized ventral structure of characteristic shape; spermatheca ( Figs 333–334 View Figs 317–339 ) small (0.2 mm) and of simple shape.

Intraspecific variation: The specimens from Laos differ slightly from those from Thailand by the shapes of the female sternite VIII and of the spermatheca ( Figs 330–334 View Figs 317–339 ), but otherwise no evidence was found suggesting that they should represent distinct species.

Comparative notes: Orphnebius cultellatus is characterized not only by the distinctive primary sexual characters, but also by the conspicuous modifications of tergite and sternite VIII.

Distribution and natural history: The species was found in two localities in North Thailand (Doi Suthep and a locality to the northeast of Chiang Mai) and two in Laos. The specimens from the type locality were collected with pitfall traps. The altitudes range from 750 to 1150 m.


Switzerland, Geneva, Museum d'Histoire Naturelle


Switzerland, Basel, Naturhistorisches Museum


Museum d'Histoire Naturelle


Natural History Museum Bucharest













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