Orphnebius (Deroleptus) discrepans, 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 : 64-65

Orphnebius (Deroleptus) discrepans spec. nov.

( Figs 54, 73, 75 , 304–306 )

Type material: Holotype ♂: “ China: S-Yunnan ( Xishuangbanna ), EKL, 23 km NW Jinghong, vic. Na Ban ( NNNR) / N22°09.49, E100°39.92, 28.VI. 2008, 730 m, forest, leg. A. Weigel / Holotypus ♂ Orphnebius discrepans sp. n., det. V. Assing 2015” ( NME).

Etymology: The specific epithet is the present participle of the Latin verb discrepare (to deviate, to disagree) and alludes the number and extent of differences between this species and other previously examined representatives of Deroleptus .

Description: Body length 4.7 mm; length of forebody 2.0 mm. Coloration: forebody black; abdomen bicoloured with segments III–V bright reddish and VI–VIII blackish; legs: pro- and mesofemora blackish, metafemora blackish with narrowly yellowish base, tibiae dark-brown with reddish bases, tarsi reddish; antennae blackish-brown with the bases of antennomeres II and III reddish-yellow; maxillary palpi blackish-brown with the apical palpomere yellowish.

Head ( Fig. 73 ) strongly transverse, 1.18 times as broad as long, posteriorly noticeably tapering behind eyes; lateral dorsal portions with sparse and very fine punctation; median dorsal portion extensively impunctate; dorsal surface without microsculpture. Eyes large and bulging, more than twice as long than postocular region and distinctly longer than the distance from posterior margin of eye to posterior constriction in dorsal view. Antenna ( Fig. 54 ) 1.8 mm long; antennomere IV weakly oblong; antennomeres V–X of conical shape, V and VI approximately a broad as long, VII–X weakly transverse, XI shorter than the combined length of IX and X.

Pronotum ( Fig. 73 ) approximately as broad as long and 1.1 times as broad as head; lateral margins straight and subparallel in dorsal view; punctation moderately dense, defined, and somewhat granulose; interstices without microsculpture; in posterior median portion with a pronounced impression, this impression extending into a long, fine, and distinct median furrow nearly reaching anterior margin of pronotum.

Elytra ( Fig. 73 ) as long as pronotum; punctation coarser than that of pronotum, defined, granulose, dense anteriorly and somewhat less dense posteriorly; interstices without microsculpture. Hind wings fully developed. Legs long and slender; metatibia 1.0 mm long; metatarsus nearly 0.9 times as long as metatibia; metatarsomere I approximately as long as the combined length of II–IV. Abdomen ( Fig. 75 ) narrower than elytra; sternites and paratergites without postero-lateral processes; tergites III and IV impunctate, except for a lateral puncture bearing a long dark seta on either side; tergite V with four punctures bearing long dark setae posteriorly, otherwise impunctate; tergite VI with a lateral puncture on either side and with four punctures posteriorly, each of these punctures bearing a long dark seta; tergite VII with a lateral puncture bearing a long dark seta on either side, in posterior fourth with longitudinal striae, posterior margin with palisade fringe; tergite VIII with coarse and dense puncture-like sculpture, with four long dark setae at posterior margin, posterior margin with a median and four lateral processes of triangular shape.

♂: sternite VIII slightly longer than tergite VIII, its posterior margin convex; median lobe of aedeagus ( Figs 304–305 ) 0.68 mm long (total length, including apical structures), of conspicuous shape, with very slender and basally strongly bent ventral process; paramere ( Fig. 306 ) 0.65 mm long and slender.

Comparative notes: This distinctive species differs from other geographically close Deroleptus species by the completely different external (habitus; coloration; punctation of the pronotum and elytra; shape of the pronotum; punctation and sculpture of the abdomen; absence of postero-lateral processes of the abdominal paratergites and sternites) and male sexual characters.

Distribution and natural history: The type locality is situated in southwestern Yunnan, Southwest China. The holotype was collected on the wing.

Figures

Figs 54–83. Antenna (54–69), forebody (70–73), abdomen (74–76), abdominal segments III–V (77, 81), lateral portion of abdominal segments III–V (78, 82), tergites VI–VII (79, 83), and hind leg (80) of Orphnebius spp. of the subgenus Deroleptus: discrepans (54, 73, 75), triapicalis (55, 71, 76), gracilior (56, 72, 77–80), sexcarinatus (57, 81–83), spoliatus (58), cultellatus (59), septemcuspis (60), vates (61), tortus (62), baccillatus (63), carinatus (64), dispar (65), laticeps (66), biimpressus (67), ulcerosus (68), falagrioides (69), siamensis (70, 74). Scale bars: 70–83: 1.0 mm; 54–69: 0.5 mm.

Figs 296–316. Orphnebius niger (296–298), O. siamensis (299–303), O. discrepans (304–306), O. triapicalis (307–310), O. gracilior (311–313), and O.sexcarinatus (314–316): tergite VIII (296, 302, 310, 311, 314); female sternite VIII (297, 312, 315); spermatheca (298, 313, 316); median lobe of aedeagus in lateral and in ventral view (299–300, 304–305, 307–308); paramere (301, 306, 309); male sternite VIII (303). Scale bars: 0.2 mm.