Amaurodera varicollis, 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 : 92

publication ID 10.21248/contrib.entomol.66.1.13-111


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Amaurodera varicollis

sp. nov.

Amaurodera varicollis View in CoL spec. nov.

( Figs 143 View Figs 119–143 , 149 View Figs 144–159 , 432–434 View Figs 420–441 )

Type material: Holotype ♂: “ Sumatra: N Sum. #29a, 5 km W Berastagi, Tongkoh , 1450 m, 3.XII.1989, Löbl, Agosti, Burckhardt / Holotypus ♂ Amaurodera varicollis sp. n., det. V. Assing 2015” ( MHNG).

Paratypes: 5 ♂♂, 1 ♀: same data as holotype ( MHNG, cAss) .

Etymology: The specific epithet (Latin, adjective: with variable pronotum) alludes to the variable morphology of the pronotum.

Description: Body length 4.2–5.3 mm; length of forebody 2.1–2.5 mm. Coloration: body brown to dark-brown with the anterior abdominal segments sometimes slightly paler; legs yellowish with (the apices of) the profemora sometimes, and with the apical portions of the meso- and metatibiae always more or less distinctly infuscate; antennae yellowish-brown to brown, with the basal and the apical antennomeres usually paler dark-yellowish; maxillary palpi yellowish.

Head ( Fig. 149 View Figs 144–159 ) oblong, 1.06–1.16 times as long as broad, broadest across eyes, with more or less pronounced sexual dimorphism; punctation sparse and extremely fine; microsculpture subject to sexual dimorphism. Eyes relatively small, slightly more than half as long as distance from posterior margin of eye to posterior constriction of head. Antenna ( Fig. 143 View Figs 119–143 ) 3.0– 3.2 mm long and very slender; antennomere IX more than twice as long as broad; antennomeres IV–VII approximately five times as long as broad.

Pronotum ( Fig. 149 View Figs 144–159 ) 0.84–0.99 mm long and of rather variable shape, 1.32–1.45 times as long as broad, and 1.02–1.09 times as broad as head, with rather variable, more or less pronounced sexual dimorphism; dorsal and lateral surface not meeting at an obtuse angle posteriorly; microreticulation reaching lateral margins neither anteriorly nor posteriorly; narrow median furrow anteriorly terminating at some distance from anterior margin of pronotum.

Elytra ( Fig. 149 View Figs 144–159 ) 0.50–0.55 times as long as pronotum; punctation extremely fine and moderately sparse; interstices with shallow or nearly obsolete microreticulation; 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 with shallow microreticulation; posterior margin of tergite VII with palisade fringe; posterior margin of tergite VIII distinctly serrate.

♂: head shallowly impressed along the middle and with nearly obsolete to distinct microsculpture; pronotum in antero-median portion more or less distinctly impressed, with more or less reduced microreticulation, and more or less glossy; median lobe of aedeagus ( Figs 432–433 View Figs 420–441 ) of rather variable size, 0.7–0.8 mm long, with conspicuously prominent crista apicalis; paramere 0.6–0.7 mm long, with rather short, broad, and flattened apical lobe.

♀: head with shallow median impression, this impression somewhat shorter and shallower than in male, dorsal surface with nearly obsolete microreticulation; pronotum in antero-median portion only slightly more glossy than on remainder of dorsal surface; spermathecal capsule ( Fig. 434 View Figs 420–441 ) 0.32 mm long, with weakly dilated distal portion and with large and proximally distinctly dilated proximal portion.

Comparative notes: Amaurodera varicollis differs from other congeners known from Sumatra particularly by the variable pronotum and by the shape of the aedeagus. The spermatheca somewhat resembles that of A. kraepelini , from which A. varicollis is distinguished by much longer and more slender antennae, longer legs, the coloration (much paler antennae and legs; yellowish maxillary palpi), a more slender head, a sexually dimorphic pronotum, an aedeagus with a much more prominent crista apicalis, and a spermatheca with an even more dilated proximal, a stouter median, and a more dilated distal portion with a larger and deeper apical cuticular invagination.

Distribution and natural history: The type locality is situated to the west of Berastagi (3°10'N, 98°31'E) in Sumatera Utara, North Sumatra ( Indonesia). The specimens, some of which are apparently slightly teneral, were collected at an altitude of 1450 m.


Switzerland, Geneva, Museum d'Histoire Naturelle


Museum d'Histoire Naturelle













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