Batrisodes linyejiei Jiang and Yin

Jiang, Ri-Xin & Yin, Zi-Wei, 2016, Two new species of Batrisodes Reitter (Coleoptera: Staphylinidae: Pselaphinae) from China, Zootaxa 4205 (2), pp. 194-200 : 194-197

Batrisodes linyejiei Jiang and Yin , new species

( Figs 1– 2 )

Type material (7 ♂♂, 5 ♀♀). Holotype: CHINA: ♂, labeled ‘ China: Sichuan, Xiaojin County (小金县), Jiajin Shan (夹金山), 30°48'49"N, 102°42'55"E, ant nest under rock, 2490 m, 20.vii.2015, Jiang, Peng, Tu & Zhou leg.’ ( SNUC) . Paratypes: CHINA: 4 ♂♂, 5 ♀♀, same label data as the holotype ( SNUC) ; 2 ♂♂, labeled ‘ China, Sichuan, Ya’an City (雅安市), Baoxing Hsien (宝兴县), Shenmulei (神木垒景区), 30°41'15"N, 102°42'13"E, 2300 m, 01.v.2016, Lin Ye-Jie & Chen Zhuo leg.’ ( SNUC) .

Diagnosis of male. The new species can be separated from all other congeners by the following combination of characters: anterior margin of frons serrated, with a bunch of thick curved setae anteromedially; vertex with lateral carinae extending from above eyes to the occipital constriction; antennomere II subequal in length as antennomere I; antennomeres XI lacking a ventral spine; profemur with a tiny protuberance at ventral margin near the middle; mesotibia with a small ventral denticle at apical third, and a large triangular apical spine; aedeagus symmetric dorso-ventrally, flattened, simple.

Description. Male. ( Fig. 1 A), Body reddish brown, BL 2.94–2.95 mm. Head ( Fig. 2 A) about as long as wide, rectangular, HL 0.55–0.58 mm, HW 0.59–0.60 mm, with large vertexal foveae, antennal tubercles prominent; frons with sinuate anterior margin and thick hook-like median setae, area between moderately raised antennal tubercles concave; clypeus medially impunctate, with round anterior margin; lateral longitudinal carinae extending from above eyes to occipital constriction, lacking median vertexal carina. Each eye composed of about 50 facets. Antenna ( Fig. 2 C) with 11 antennomeres; club loosely formed by three apical antennomeres, scapes and pedicel enlarged and elongate, antennomeres III–XI moniliform. Pronotum about as long as wide, PL 0.61 mm, PW 0.58– 0.60 mm, disc slightly convex; with distinct median antebasal fovea; median and lateral longitudinal sulci present. Elytra much wider than long, EL 0.94–0.95 mm, EW 1.02–1.04 mm; each elytron with three small but distinct basal foveae, inner two close; discal striae shallow and short. Mesofemora ( Fig. 2 D) with thin but distinct ventral spine near middle; mesotibiae (Fig. 5E) with small ventral denticle at apical 2/5, and large triangular apical spine. Abdomen slightly wider than long, AL 0.81–0.84 mm, AW 0.83–0.85 mm; tergite IV (first visible tergite) longest, about 2.5 times as long as next, with strongly oblique marginal carinae. Length of aedeagus ( Fig. 2 F–G) 0.37 mm; median lobe simple, flattened, nearly symmetric.

Female ( Fig. 1 B). General habitus similar to male, frons ( Fig. 2 B) unmodified; each eye composed of about 35 facets; pedicel relatively shorter in relation to scape; legs lacking denticle and spine; tergite VIII ( Fig. 2 H) semicircular; sternite VIII ( Fig. 2 I) transverse; symmetric genital complex ( Fig. 2 J) weakly sclerotized. Measurements of body parts: BL 3.02–3.06 mm, HL 0.58 mm, HW 0.60–0.62 mm, PL 0.62 mm, PW 0.60 mm, EL 0.96–0.98 mm, EW 1.02–1.06 mm, AL 0.86–0.88 mm, AW 0.82–0.83 mm.

Distribution. Southwestern China: Sichuan.

Host ant. Formica sp.

Figures

FIGURE 1. Dorsal habitus of Batrisodes linyejiei. A. Male. B. Female. Scale: 0.5 mm.

FIGURE 2. Diagnostic features of Batrisodes linyejiei (A, C – G. Male. B, H – J. Female). A, B. Head, in dorsal view. C. Antenna. D. Mesofemur. E. Mesotibia. F. Aedeagus, in ventral view. G. Same, in lateral view. H. Tergite VIII. I. Sternite VIII. J. Genital complex. Scales: A – G = 0.2 mm; H – J = 0.1 mm.