Batrisodes bamian Yin, Shen & Li

Yin, Zi-Wei, Shen, Jia-Wei & Li, Li-Zhen, 2015, New species and new combinations of Asian Batrisodes Reitter (Coleoptera, Staphylinidae, Pselaphinae), and synonymy of Batrisodellus Jeannel with Batrisodes, Deutsche Entomologische Zeitschrift 62 (1), pp. 45-54 : 45

Taxon classification Animalia Coleoptera Staphylinidae

Batrisodes bamian Yin, Shen & Li sp. n. Figs 1B, 3

Type material

(5 ♂♂, 1 ♀). Holotype: China: ♂, labeled 'China: Hunan, Guidong Co. [桂东县], Bamian Shan [八面山], 25°59 ’46’’ N, 113°41 ’59’’ E, 1825 m, colony of Pseudolasius sp. nesting under moss on rock, 04.vi.2014, Peng & Shen’ (SNUC). Paratypes: China: 4 ♂♂, 1 ♀, same label data as holotype (SNUC).

Description.

Male (Fig. 1B). Body reddish brown, BL 2.92-2.93 mm. Head about as long as wide, HL 0.55-0.57 mm, HW 0.54-0.55 mm; with small vertexal foveae; frons lacking modification, slightly concave between moderately raised antennal tubercles; clypeus medially impunctate, with round anterior margin; lateral vertexal carinae present from level of midpoints of eyes to posterolateral margins of head, median vertexal carina short; each eye composed of about 60 facets, lacking ocular canthi; postgenal area with numerous long erect setae visible in dorsal view. Antennae lacking distinct club (Fig. 3 A–B), IX strongly protruding at lateral margins, X unmodified, XI large, with distinct basal denticle. Pronotum slightly longer than wide, PL 0.63-0.66 mm, PW 0.55-0.57 mm; disc slightly convex; median longitudinal sulcus thin and shallow, lateral sulci more distinct; lacking median antebasal fovea; with indistinct antebasal tubercles. Elytra wider than long, EL 0.88-0.91 mm, EW 1.02-1.03 mm; each elytron with three nude basal foveae; with short discal striae; marginal striae present in posterior half of flank. Mesofemora (Fig. 3C) with small, blunt ventral spine near middle, mesotibiae (Fig. 3D) with small ventral denticle and apical spur; metatibiae lacking long apical tuft of setae. AL 0.79-0.86 mm, AW 0.93-0.95 mm; abdominal tergite IV (first visible tergite) with oblique marginal carinae; discal carinae as short, triangular ridges. Length of aedeagus (Fig. 3 E–G) 0.79 mm, median lobe symmetric, endophallus comprising two sclerites.

Female. Much smaller than male, antennae and legs lacking modification and spine; each eye composed of about 40 facets. Tergite VIII (Fig. 3H) and sternite VIII (Fig. 3I) transverse. Genital complex (Fig. 3J) well-sclerotized, width 0.37 mm. BL 2.67 mm, HL 0.52 mm, HW 0.53 mm, PL 0.59 mm, PW 0.53 mm, EL 0.78 mm, EW 0.93 mm, AL 0.78 mm, AW 0.86 mm.

Differential diagnosis.

The stout habitus and modified antennomere IX, combined with the unique form of the aedeagus readily separates the new species from all other congeners.

Biology.

The adults were collected from colonies of a Pseudolasius ant nesting under moss on rocks.

Distribution.

Central China: Hunan.

Etymology.

The specific epithet refers to the type locality of the new species, Bamian Mountain.