Elytrobium gongganum, 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 : 224-225

publication ID	https://doi.org/ 10.21248/contrib.entomol.63.2.219-239
persistent identifier	https://treatment.plazi.org/id/038EE37E-FC40-FFBF-FCE7-6984FD206B8B
treatment provided by	Carolina
scientific name	Elytrobium gongganum
status	sp. nov.

Treatment

Elytrobium gongganum View in CoL sp. n.

( Figs 7-13 View Figs 1-13 , Map 1 View Map 1 )

Type material:

Holotype : “ CHINA, Sichuan, Gongga Shan, Lake abv. Camp 2, 2750 m, 25.7.1994, A. Smetana [C23] / Holotypus  Elytrobium gongganum sp. n., det. V. Assing 2013” (cAss).

Etymology:

The specific epithet is an adjective derived from the name of the mountain where this species was discovered.

Description:

Body length 7.8 mm; length of forebody 4.0 mm. Habitus as in Fig. 7 View Figs 1-13 . Coloration: body black; legs black with reddish tarsi; antennae with basal half blackish, apical half gradually becoming paler towards apex.

Head ( Fig. 8 View Figs 1-13 ) 1.05 times as long as broad, broadest across eyes, and weakly tapering behind eyes; posterior angles broadly rounded, indistinct; frons transversely impressed and with pronounced microsculpture; punc- tation coarse and dense, slightly sparser in median dorsal portion; interstices narrower than diameter of punctures (except in median dorsal portion), with distinct microreticulation, and subdued shine. Eyes moderately large and composed of numerous fine ommatidia, approximately 0.6 times as long as postocular region from posterior margin of eye to neck in dorsal view. Antenna 2.0 mm long; antennomeres IV-X weakly oblong. Maxillary palpomere III slender, approximately 3.5 times as long as broad.

Pronotum ( Fig. 8 View Figs 1-13 ) 1.16 times as long as broad and 1.15 times as broad as head, strongly convex in crosssection, broadest slightly behind middle; lateral margins distinctly convex in dorsal view; punctation similar to that of head; interstices with very shallow, nearly obsolete microreticulation; impunctate median band narrow.

Elytra ( Fig. 8 View Figs 1-13 ) 1.15 times as long as pronotum; punctation dense, fine, and indistinctly seriate; interstices without microreticulation. Hind wings fully developed. Protarsomeres I-IV strongly dilated. Metatarsomere I approximately as long as II.

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

: sternite VII ( Fig. 9 View Figs 1-13 ) moderately transverse and with weakly concave posterior margin, pubescence unmodified; sternite VIII ( Fig. 10 View Figs 1-13 ) weakly oblong, posterior excision very shallow, but with noticeable angle in the middle, pubescence unmodified; sternite IX nearly symmetric and apically with long and acute process ( Fig. 11 View Figs 1-13 ); aedeagus 0.75 mm long, shaped as in Figs 12-13 View Figs 1-13 .

Comparative notes:

Elytrobium gongganum is distinguished from E. monilicorne by larger body size, the more slender antennae with oblong antennomeres IV-X, the much more slen- der maxillary palpomere III, the much finer and indistinctly seriate punctation of the elytra, the differently shaped male sternite VIII, as well as by the shape of the aedeagus.

Distribution and natural history:

The type locality is situated in the Gongga Shan, a mountain in western Sichuan ( Map 1 View Map 1 ). The holotype was sifted from wet moss and grassy vegetation on large fallen trees in a swampy habitat around a shallow forest pond at an altitude of 2750 m (SMETANA pers. comm.) .