Lobrathium diaoluoense Li & Li

Li, Wen-Rong, Zhao, Mei-Jun, Dai, Cong-Chao & Li, Li-Zhen, 2013, New species and records of Lobrathium Mulsant & Rey (Coleoptera, Staphylinidae, Paederinae) from China, ZooKeys 304, pp. 49-81 : 60-61

Lobrathium diaoluoense Li & Li sp. n. Figs 7

Type material

(10 ♂♂, 16 ♀♀). Holotype, ♂: "China, Hainan, Lingshui County, Diaoluo Shan, 1000 m, 18°43'N, 109°51'E, 24 –IV– 2012, Peng Zhong & Dai Cong-chao leg. / Holotype ♂, Lobrathium diaoluoense , sp. n., Li & Li, det. 2013". Paratypes, 9 ♂♂,16 ♀♀: same data as holotype.

Description.

Body length 4.61-5.95 mm, length of fore body 2.94-3.28 mm. Habitus as in Fig. 7A. Coloration: body black, posterior portion of elytra with yellowish spot reaching posterior and lateral margins; legs with paler tarsi; antennae yellowish.

Head as long as broad or weakly oblong (HL/HW = 1.0-1.09); posterior angles marked; punctation coarse and dense, sparser in median dorsal portion, interstices without microsculpture. Eyes large, more than half as long as distance from posterior margin of eye to neck. Antenna slender, 1.54-1.78 mm long.

Pronotum slender, approximately as wide as head (PL/PW = 1.25-1.31, PW/HW = 0.96-1.0), lateral margins weakly convex in dorsal view; punctation dense and coarse, similar to that of head, median dorsal portion more sparsely punctate or impunctate; interstices without microsculpture and glossy.

Elytra longer and broader than pronotum (EL/EW = 1.09-1.15, EW/PW = 1.24-1.37, EL/PL = 1.11-1.14); humeral angles marked; punctation coarse and dense, interstices without microsculpture and glossy. Hind wings fully developed.

Abdomen distinctly narrower than elytra; punctation fine and dense; posterior margin of tergite VII with palisade fringe; posterior margin of tergite VIII weakly concave, without appreciable sexual dimorphism.

Male. Sternite VII (Fig. 7D) with deep and broad median impression without pubescence, posterior margin broadly and rather strongly concave; sternite VIII oblong, with deep and large U-shaped posterior excision (Fig. 7F), without modified setae, on either side of posterior excision with long dark setae; aedeagus (Figs 7B, C) with ventral process of very distinctive morphology, furcate apically, and this bifurcation forming an angle of less than 30 degrees in lateral view.

Female. Posterior margin of tergite VIII (Fig. 7G) weakly convex; sternite VIII (Fig. 7H) of similar shape as tergite VIII; tergite IX (Fig. 7I) undivided anteriorly; tergite X of subovoid shape.

Etymology.

The specific epithet (adjective) is derived from the Diaoluo Shan where the type locality is situated.

Comparative notes.

This species is similar to Lobrathium bipeniculatum Assing (2010) and Lobrathium pengi Li & Li sp. n. (described below) in sharing similar shapes of the male sternites VII and VIII, and of the aedeagus. It can be separated from Lobrathium bipeniculatum by the broader median impression of the male sternite VII (Fig. 7D), and by the absence of clusters of long dark setae at the margins of the posterior excision of the male sternite VIII (Fig. 7F). In Lobrathium pengi , the ventral process of the aedeagus is of different shape, with the apical bifurcation forming an angle of more than 30 degrees in lateral view.

Habitat and distribution.

The present species was sifted from wet moss on stones alongside a reservoir (red circle in Fig. 20B) in the Diaoluo Shan, Hainan (Fig. 19), in April.