Tetrabothrus collucatus, 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 : 98-99

Tetrabothrus collucatus spec. nov.

( Figs 157–158 , 442–443 )

Type material: Holotype ♂: “ Laos-N (Louangphrabang), 11–21.v.2002, 19°35'N 101°58'E, Tong Khan , ~ 750 m, Vit Kubán leg. / Holotypus ♂ Tetrabothrus collucatus sp. n., det. V. Assing 2015” ( NHMB).

Paratypes: 1 ♂, 3 ♀♀: same data as holotype ( NHMB, cAss) .

Comment: The specific epithet is the past participle of the Latin verb collucare (to shorten, to clip) and alludes to the short apex of the ventral process of the aedeagus.

Description: Body length 4.8–5.9 mm; length of forebody 2.1–2.5 mm. Coloration: body blackish-brown with the posterior margins of the abdominal segments darkreddish; legs with the profemora and the apical third of the meso- and metafemora dark-brown to blackish, the basal portions of the meso- and metafemora yellowish, the tibia pale-brown to dark-brown, and the tarsi dark-yellowish to pale-brown; antennae blackish with antennomeres I–III and XI brown to dark-brown; maxillary palpi yellowish-red.

Head ( Fig. 157 ) strongly transverse, 1.30–1.35 times as broad as long, extensively impunctate in the middle; punctation in lateral dorsal portions very fine and sparse. Eyes large, approximately as long as distance from posterior margin of eye to posterior constriction of head, or nearly so. Antenna ( Fig. 158 ) 1.2–1.3 mm long.

Pronotum ( Fig. 157 ) approximately 1.15 times as broad as long and approximately 1.12 times as broad as head, strongly convex in cross-section; punctation very fine and sparse.

Elytra ( Fig. 157 ) approximately 0.9 times as long as pronotum; punctation very fine and sparse. Hind wings fully developed. Metatarsomere slightly longer than the combined length of metatarsomeres II and III.

Abdomen slightly narrower than elytra and with rather deep anterior impressions on tergites III–VI; tergites III– VI with a lateral seta and two fine and rather short postero-lateral setae (at posterior margin) on either side, otherwise impunctate; tergite VII with two lateral setae on either side; tergite VIII with numerous setae at and near posterior margin; posterior margin of tergite VII with palisade fringe; posterior margin of tergite VIII truncate.

♂: median lobe of aedeagus ( Figs 442–443 ) approximately 0.5 mm long; ventral process weakly curved in lateral view, broad in ventral view, and with short apex; paramere slightly longer than median lobe, its apical lobe of moderate length and somewhat conical.

Comparative notes: Tetrabothrus collucatus differs from all its geographically close congeners of similar coloration particularly by the distinctive shape of the ventral process of the aedeagus.

Distribution: The type locality is situated to the southwest of Luang Prabang in North Laos at an altitude of approximately 750 m.

Figures

Figs 144–159. Amaurodera thailandensis (144–145), A. fasciata (146), A. meorum (147), A. spinans (148), A. varicollis (149), A. disparicollis, male (150), A. disparicollis, female (151), Tetrabothrus nilgiricus (152–153), T. pubescens, syntype (154–156), T. collucatus (157–158), and T. neoguineensis, holotype (159): forebody (144–152, 154, 157, 159); abdomen (153, 156); antenna (155, 158). Scale bars: 144–154, 156–157, 159: 1.0 mm; 155, 158: 0.5 mm.

Figs 442–458. Tetrabothrus collucatus (442–443), T. borneensis (444–449), T. punctiventris (450–451), T. sulawesicus (452–454), Zyras illecebrosus, paratype (455–456), and Z. quasar, holotype (457–458): median lobe of aedeagus in lateral and in ventral view (442–445, 450–453, 455–458); apico-ventral portion of median lobe in lateral view (446–448); male sternite VIII (449, 454). Scale bars: 0.2 mm.