Elytrobium seminitidum, Assing, 2013

Assing, Volker, 2013, Two new genera of Lathrobiina from the East Palaearctic region (Coleoptera: Staphylinidae: Paederinae), Beiträge Zur Entomologie = Contributions to Entomology 63 (2), pp. 219-239 : 227

Elytrobium seminitidum sp. n.

( Figs 22-29 , Map 1 )

Type material:

Holotype : “ CHINA, Jiangxi prov., 27.iv.2011, Jinggang Shan Mts. , SONGMUPING (stream valley), 26°34.7'N, 114°04.3'E, 1280 m, M. Fikáček & J. Hájek leg. / Holotypus  Elytrobium seminitidum sp. n., det. V. Assing 2013” ( NMP).

Etymology:

The specific epithet (Latin, adjective: half-shiny) alludes to the glossy pronotum and elytra distinctly contrasting with the matt head.

Description:

Small species; body length 6.0 mm; length of forebody 3.0 mm. Habitus as in Fig. 22 . Coloration: body black; legs reddish-brown with reddish tarsi and infuscate profemora; antennae reddish with slightly darker antennomere I.

Head ( Fig. 23 ) 1.08 times as long as broad, broadest across eyes, and distinctly tapering behind eyes; posterior angles broadly rounded, indistinct; punctation coarse and dense, sparser in median dorsal portion; interstices nar- rower than diameter of punctures (except in median dorsal portion), with very distinct microreticulation, nearly matt. Eyes moderately large and composed of numerous fine ommatidia, approximately half as long as postocular region from posterior margin of eye to neck in dorsal view. Antenna ( Fig. 24 ) 1.5 mm long; antennomeres IV-X approximately as long as broad. Maxillary palpi with palpomere III moderately dilated, approximately 2.5 times as long as broad.

Pronotum ( Fig. 23 ) rather slender, 1.2 times as long as broad and 1.06 times as broad as head, distinctly convex in cross-section, broadest slightly behind middle; lateral margins weakly convex in dorsal view; punctation similar to that of head; interstices glossy, without microreticulation; impunctate median band confined to posterior half.

Elytra ( Fig. 23 ) moderately long, 1.03 times as long as pronotum; punctation dense, as coarse as that of pronotum, defined, and indistinctly seriate; interstices without microreticulation, glossy. Hind wings fully developed. Protarsomeres I-IV strongly dilated. Metatarsomere I approximately as long as II.

Abdomen narrower than elytra, segments III-VI of subequal width; punctation very dense and coarse on anterior tergites, gradually becoming finer and sparser towards the abdominal apex; interstices on tergites III-VI with indistinct microreticulation and glossy, on tergites VII-VIII with slightly more distinct microsculpture; posterior margin of tergite VII with palisade fringe.

: sternite VII ( Fig. 25 ) weakly transverse, approximately 1.15 times as broad as long, and with very weakly concave posterior margin, pubescence unmodified; sternite VIII ( Fig. 26 ) 1.08 times as long as broad, posterior excision deeper than in other species of the genus; pubescence unmodified; sternite IX ( Fig. 27 ) symmetric and apically acute; aedeagus 0.54 mm long, ventral process abruptly bent subapically ( Figs 28-29 ).

Comparative notes:

Elytrobium seminitidum is characterized particularly by the glossy pronotum, elytra, and abdomen distinctly contrasting with the matt head, by the relatively short elytra, by the weakly transverse sternite VII, by the deeper posterior excision of the male sternite VIII, and by the shape of the aedeagus. It additionally differs from the preceding species by smaller body size.

Distribution and natural history:

The type locality is situated in the Jinggang Shan, Jiangxi province, southeastern China ( Map 1 ), at an altitude of 1280 m .

Figures

Map 1: Distribution of Elytrobium gen. n. in the southeastern East Palaearctic region: E. gongganum sp. n. (open circle); E. qinlinganum sp. n. (open triangle); E. scindens sp. n. (filled diamonds); E. seminitidum sp. n. (open diamond); E. alesianum sp. n. (filled circles); E. monilicorne (SHARP) (filled triangle).

Figs 14-29: Elytrobium qinlinganum sp. n. (14-21) and E. seminitidum sp. n. (22-29): habitus (14, 22); forebody (15, 23); antenna (16, 24); male sternite VII (17, 25); male sternite VIII (18, 26); male sternite IX (19, 27); aedeagus in lateral and in ventral view (20-21, 28-29). Scale bars: 14-15, 22-23: 1.0 mm; 16-18, 24-26: 0.5 mm; 19-21, 27-29: 0.2 mm.