Sinlathrobium densepunctatum, 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 : 234-236

Sinlathrobium densepunctatum sp. n.

( Figs 58-65 , Map 2 )

Type material:

Holotype : “ CHINA Sichuan pass Tianquan-Luding 3000 m, 29°51.44'N 102°16.48'E 7.VI.2001, M. Janata / Holotypus  Sinlathrobium densepunctatum sp. n., det. V. Assing 2013” (cAss).

Etymology:

The specific epithet (Latin, adjective) refers to the densely punctate abdomen.

Description:

Body length 7.7 mm; length of forebody 4.1 mm. Habitus as in Fig. 58 . Coloration: body black, elytra with rather extensive orange spot in postero-lateral angles, this spot reaching posterior and lateral margins, but not suture, humeral angles diffusely and indistinctly dark-reddish; legs with the femora blackish, the tibiae brown, and the tarsi reddish; antennae dark-brown, with antennomere I blackish and the bases of II and III reddish.

Head ( Fig. 59 ) 1.17 times as broad as long, broadest across eyes, tapering behind eyes; dorsal surface between eyes uneven, in the middle with densely punctate impression; punctation coarse, dense, and somewhat areolate; interstices reduced to narrow ridges, with distinct microreticulation and nearly matt. Eyes strongly bulging, approximately 0.8 times as long as postocular region from posterior margin of eye to neck in dorsal view. Antenna ( Fig. 60 ) 2.3 mm long; antennomeres IV-VIII distinctly, IX-X weakly oblong.

Pronotum ( Fig. 59 ) 1.13 times as long as broad and 0.93 times as broad as head, distinctly convex in crosssection, broadest slightly before middle; lateral margins convex in dorsal view; punctation coarse, very dense in anterior third, somewhat less dense posteriorly; interstices glossy, without microsculpture; impunctate midline narrow and confined to posterior two-thirds of pronotum.

Elytra ( Fig. 59 ) 0.95 times as long as pronotum; punctation moderately dense, much finer than that of head and pronotum; interstices without microsculpture. Metatibia rather short, 1.1 mm long.

Abdomen slightly narrower than elytra; tergites III-IV anteriorly with coarse punctures, remainder of tergites III-VI with very fine and dense punctation, tergites VII-VIII with distinctly sparser punctation; posterior margin of tergite VII with palisade fringe.

: sternites III-VI without median impressions; sternite VII ( Fig. 61 ) strongly transverse, 2.0 times as broad as long, with distinct postero-median impression, this impression with sparse black setae, near posterior margin on either side of postero-median impression with distinct transverse cluster of numerous stout black setae; sternite VIII ( Fig. 62 ) transverse and with postero-median impression, postero-median portion without setae, posterior excision shallow; aedeagus ( Figs 64-65 ) 1.1 mm long and symmetric; ventral process short and broad in ventral view; dorsal plate weakly sclerotized, apical portion broad, basal portion short and narrow.

: unknown.

Comparative notes:

Sinlathrobium densepunctatum is easily distinguished from its congeners by the convex lateral margins of the pronotum in dorsal view, shorter tibiae, the finer and sparser punctation of the elytra, darker legs, the conspicuously dense and fine punctation of the abdomen, the more strongly transverse male sternite VII with a posterior pair of pronounced transverse clusters of stout black setae, the shallower posterior excision of the male sternite VIII, and by the shorter and broader ventral process of the aedeagus in ventral view.

Distribution and natural history:

The type locality is situated approximately 8 km to the southeast of Luding in western Sichuan ( Map 2 ), at an altitude of 3000 m. Additional data are not available.

Figures

Map 2: Distribution of Sinlathrobium gen. n. in China: S. lobrathiforme (ASSING) (triangle); S. iniquum sp. n. (diamond); E. densepunctatum sp. n. (star); S. lobrathioides (ASSING) (circle).

Figs 58-71:Sinlathrobium densepunctatumsp. n. (58-65) andS. lobrathiforme(ASSING) (66-71): habitus(58); forebody (59); antenna (60); male sternite VII (61); male sternite VIII (62); male sternite IX (63); aedeagus in lateral and in ventral view (64-65); median portion of ventral aspect of head (66); mandibles in ventral view (67); labrum (68); maxillary palpus (69); labium (70); ligula (71). Scale bars: 58-59: 1.0 mm; 60-65: 0.5 mm; 66-70: 0.2 mm; 71: 0.1 mm.