Amaurodera disparicollis, 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 : 90-91

publication ID 10.21248/contrib.entomol.66.1.13-111


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scientific name

Amaurodera disparicollis

sp. nov.

Amaurodera disparicollis View in CoL spec. nov.

( Figs 141 View Figs 119–143 , 150–151 View Figs 144–159 , 423–429 View Figs 420–441 )

Type material: Holotype ♂: “ Sumatra: Jambi, km 15 Sungaipenuh to Tapan, 1450 m, 9.XI.1989, Agosti, Löbl, Burckh. #10 / Holotypus ♂ Amaurodera disparicollis sp. n., det. V. Assing 2015” ( MHNG).

Paratype ♀: same data as holotype (cAss) .

Etymology: The specific epithet (Latin, adjective: with different pronotum) alludes to the pronounced sexual dimorphism of the pronotum.

Description: Body length 5.5–5.8 mm; length of forebody 2.6–2.7 mm. Coloration: forebody brown to dark-brown; abdomen reddish-brown to brown, with segments VI– VII slightly darker; legs yellowish, with the profemora pale-brown, the mesofemora brown with yellowish bases, and the metafemora brown with the basal third yellowish; antennae uniformly yellowish or pale-brown with the apical antennomeres yellowish; maxillary palpi yellowish-brown with the terminal palpomere yellowish.

Head ( Figs 150–151 View Figs 144–159 ) oblong, 1.06–1.10 times as long as broad, broadest across eyes, with moderate sexual dimorphism; punctation sparse and extremely fine; interstices without microreticulation. Eyes of moderate size, 0.6–0.7 times as long as distance from posterior margin of eye to posterior constriction of head. Antenna ( Fig. 141 View Figs 119–143 ) 3.1–3.2 mm long; antennomere IX twice as long as broad.

Pronotum ( Figs 150–151 View Figs 144–159 ) 1.04–1.06 mm long, 1.36– 1.41 times as long as broad, and 1.06–1.09 times as broad as head, with rather pronounced sexual dimorphism; dorsal and lateral surface meeting at an obtuse angle posteriorly; anterior one-sixth to one-fifth of dorsal surface with very shallow microreticulation and glossy; microreticulation reaching lateral margins neither anteriorly nor posteriorly; narrow median furrow anteriorly terminating at some distance from anterior margin of pronotum.

Elytra ( Figs 150–151 View Figs 144–159 ) 0.55–0.56 times as long as pronotum; punctation extremely fine and moderately sparse; interstices with nearly obsolete microreticulation, traces of which may be visible at high magnification (100 x); pubescence moderately long and semi-erect. Hind wings present. Metatarsomere I approximately as long as the combined length of II and III.

Abdomen narrower than elytra; punctation fine and very sparse on all tergites; tergites III–V with shallow, nearly obsolete microsculpture composed of transverse meshes, tergites VI–VIII without appreciable microreticulation (except near anterior margins); posterior margin of tergite VII with palisade fringe; posterior margin of tergite VIII distinctly serrate.

♂: head shallowly impressed along the middle; pronotum ( Figs 423–424 View Figs 420–441 ) antero-laterally with an oblique elevation on either side, antero-median portion impressed and extensively glossy; median lobe of aedeagus ( Figs 427–428 View Figs 420–441 ) large, 1.0 mm long; ventral process rather broad in ventral view; paramere 0.93 mm long, with rather short, broad, and flattened apical lobe.

♀: head with shallow median impression, this impression somewhat shorter than in male; pronotum ( Figs 425-426 View Figs 420–441 ) without antero-lateral elevations, in antero-median portion not impressed and much less extensively glossy; spermathecal capsule ( Fig. 429 View Figs 420–441 ) with weakly dilated distal portion and with large and proximally distinctly dilated proximal portion.

Comparative notes: This species is characterized particularly by relatively large size, long antennae, the secondary sexually dimorphic head and pronotum, and a large median lobe of the aedeagus. Previously, the sole representative of the genus known from Sumatra was A. nigra CAMERON, 1925 , which is distinguished from A. disparicollis by smaller size and darker coloration alone.

Distribution and natural history: The type locality (approximately 2°02'S, 101°18'E) is situated in the southwest of Sumatra ( Indonesia), near the border between Jambi and Sumatera Barat. The specimens were collected at an altitude of 1450 m, together with the following species and a male of an unnamed species.


Switzerland, Geneva, Museum d'Histoire Naturelle


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