Amaurodera gilvios, 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 : 84-85

publication ID	https://doi.org/ 10.21248/contrib.entomol.66.1.13-111
DOI	https://doi.org/10.5281/zenodo.5903492
persistent identifier	https://treatment.plazi.org/id/766F7C36-FFF6-FFA3-FCB4-70D4D943F802
treatment provided by	Felipe
scientific name	Amaurodera gilvios
status	sp. nov.

Treatment

Amaurodera gilvios View in CoL spec. nov.

( Figs 128, 133 View Figs 119–143 , 389–390, 395 View Figs 379–395 )

Type material: Holotype ♂: “ Thailand: Chanthaburi, Khao Sabap Nat. Park , 150–300 m, 23.–24.XI.85, Burckhardt-Löbl / Holotypus ♂ Amaurodera gilvios sp. n., det. V. Assing 2015” ( MHNG).

Paratype ♀: same data as holotype (cAss) .

Etymology: The specific epithet is a noun in apposition composed of the Latin adjective gilvus (yellow) and the Latin noun os (leg). It alludes to the uniformly yellowish legs, a character distinguishing this species from most other Amaurodera species known from Thailand.

Description: Body length 4.0– 4.3 mm; length of forebody 1.8–2.0 mm. Coloration: forebody pale reddish-brown; abdomen: tergites III–IV and VIII–X pale-reddish, tergite V pale-reddish or with somewhat darker disc, tergite VI dark-brown, tergite VII dark-brown with reddish posterior margin; legs, antennae, and maxillary palpi yellowish.

Head ( Fig. 128 View Figs 119–143 ) weakly transverse, broadest across eyes, with sexual dimorphism; punctation sparse and extremely fine; interstices without microreticulation. Eyes large and bulging, but noticeably shorter than distance from posterior margin of eye to posterior constriction of head. Antenna ( Fig. 133 View Figs 119–143 ) 2.1–2.2 mm long and very slender.

Pronotum ( Fig. 128 View Figs 119–143 ) 0.70–0.77 mm long, approximately 1.4 times as long as broad, and slightly narrower than head; with two erect lateral setae on either side anteriorly; dorsal surface matt; dorsal and lateral surface not meeting at an angle posteriorly; microreticulation reaching lateral carinae only in posterior half; narrow median furrow long, but reaching neither anterior nor posterior margins.

Elytra ( Fig. 128 View Figs 119–143 ) 0.57–0.58 times as long as pronotum; punctation fine and sparse; interstices seemingly without microsculpture, traces of microreticulation visible only at high magnication (at least 100 x); pubescence short and depressed. Hind wings present. Metatarsomere I approximately as long as the combined length of II and III, or slightly longer.

Abdomen narrower than elytra; punctation fine and rather sparse on anterior, even sparser on posterior tergites; interstices with microsculpture composed of transverse meshes; posterior margin of tergite VII with palisade fringe; posterior margin of tergite VIII distinctly serrate.

♂: head with shallow, but extensive median impression; median lobe of aedeagus ( Figs 389–390 View Figs 379–395 ) 0.6 mm long and of distinctive shape, apically flattened dorso-ventrally; ventral process suborbicular in apical portion; crista apicalis pronounced.

♀: head without dorsal impression; spermatheca as in Fig. 395 View Figs 379–395 .

Comparative notes: This species is characterized particularly by the distinctive shape of the median lobe of the aedeagus. It is additionally distinguished from other Amaurodera species known from Thailand by the uniformly yellowish legs and the shape of the spermatheca, from most species also by the uniformly pale-reddish abdominal tergites III–IV.

Distribution and natural history: Khao Sa Bap National Park (approximately at 12°33'N, 102°12'E) is situated to the southeast of Chanthaburi in southeastern Thailand. The type specimens were collected at an altitude of 150– 300 m.