Orphnebius (Deroleptus) baccillatus, 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 : 72

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



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scientific name

Orphnebius (Deroleptus) baccillatus

sp. nov.

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

( Figs 63 View Figs 54–83 , 90, 101 View Figs 84–101 , 109 View Figs 102–118 , 348–350 View Figs 340–358 )

Type material: Holotype ♀: “ Lao, Phongsaly prov ., 21°41–2'N 102°06–8'E, 28.v.–20.vi.2003, Phongsaly env. , ~ 1500 m, Vít Kubáň leg. / Holotypus ♀ Orphnebius baccillatus sp. n., det. V. Assing 2015” ( NHMB).

Etymology: The specific epithet is an adjective derived from the Latin noun baccillum (walking stick, cane) and alludes to the conspicuous shape of the spermatheca.

Description: Body length 6.2 mm; length of forebody 2.5 mm. Coloration: head blackish-brown; pronotum brown with broadly pale-brown margins; elytra brown; abdomen pale reddish-brown with the posterior twothirds of tergite VII dark-brown; legs pale-reddish; antennae reddish; maxillary palpi pale-reddish, with the terminal palpomere yellowish.

Head ( Fig. 90 View Figs 84–101 ) dorso-ventrally flattened, strongly transverse, 1.5 times as broad as long, and with marked posterior angles; dorsal surface with fine and sparse punctation, median dorsal portion impunctate; interstices without microsculpture. Eyes extremely large, extending along almost all of lateral margins of head nearly to posterior margin. Antenna ( Fig. 63 View Figs 54–83 ) 1.7 mm long, not incrassate; antennomeres IV–V approximately as long as broad, VI–X very weakly transverse and of subequal width; XI slightly longer than the combined length of IX and X.

Pronotum ( Fig. 90 View Figs 84–101 ) small and strongly transverse, broadest across anterior angles, 1.42 times as broad as long, and 0.90 times as broad as head, moderately convex in cross-section; lateral margins straight, weakly converging posteriad in dorsal view; punctation very fine and moderately sparse; pubescence depressed, short, and pale; near anterior angles with a stout, erect, black seta on either side.

Elytra ( Fig. 90 View Figs 84–101 ) 1.37 times as long as pronotum; punctation moderately dense and fine; pubescence pale, short, and depressed. Hind wings present. Legs long and slender; metatibia 1.2 mm long; metatarsus approximately 0.9 times as long as metatibia; metatarsomere I approximately as long as the combined length of II and III.

Abdomen ( Figs 101 View Figs 84–101 , 109 View Figs 102–118 ): sternite III with a large, but not very long lateral extension of triangular shape; sternite IV with long, slender but somewhat massive, weakly erect, and apically acute postero-lateral extension; paratergite IV with a smaller spine-shaped posterior extension; posterior extensions of paratergites and sternite IV contiguous; tergites III–VI each with a lateral puncture bearing a dark seta on either side, tergite VI additionally with four setiferous punctures at posterior margin; tergite VII in posterior two-thirds with very dense and coarse non-setiferous punctation, near posterior margin with a transverse row of eight setiferous granules, posterior margin with palisade fringe; tergite VIII ( Fig. 348 View Figs 340–358 ) with numerous setiferous granules in posterior portion, with dense short pubescence anteriorly, with a transverse series of non-setiferous teeth near posterior margin, with numerous small gland openings near anterior margin, and with a pair of clusters of gland openings anteriorly, posterior margin weakly concave; sternite VIII ( Fig. 349 View Figs 340–358 ) transverse and with smoothly convex posterior margin.

♀: spermatheca ( Fig. 350 View Figs 340–358 ) of distinctive shape, very long (0.6 mm), distal portion shaped like a walking stick, in transitional portion between distal and proximal portion somewhat coiled.

Comparative notes and comment: Orphnebius baccillatus differs from its consubgeners by distinctive external and sexual characters (large eyes, shape of pronotum, shapes of postero-lateral extensions of abdominal sternites III–IV and paratergite IV, the conspicuous shape and sculpture of tergite VIII, shape of the spermatheca). The species is additionally distinguished from O. vates , the only other large-eyed Deroleptus species known from Laos, by much larger size.

Distribution and natural history: The type locality is situated near Phongsaly in North Laos and nearly identical to that of O. vates . The holotype was collected at an altitude of approximately 1500 m.


Switzerland, Basel, Naturhistorisches Museum


Natural History Museum Bucharest













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