Batrisus sibiricus Sharp, 1874

Yin, Zi-Wei, Jiang, Ri-Xin & Chen, Zhi-Bing, 2017, Notes on the Pselaphinae (Coleoptera: Staphylinidae) in Shanghai, China, Zootaxa 4238 (3), pp. 433-439 : 436

Batrisus sibiricus Sharp, 1874

( Figs 2 A, 3J, 4A)

Material examined. (1 ♂), labeled ‘ China: Shanghai, Xuhui District (徐汇区), Huashan Green Space (华山绿地), 31°12'29"N, 121°25'40"E, alt. 10 m, v.2004, Xiao-Bin Song leg.’ ( SNUC).

Distribution. Russia: East Siberia, Far East; Korean Peninsula; China: Beijing, Shanghai (new provincial record), Sichuan.

Comments. This widely distributed species can be readily recognized by the presence of an ocular canthi ( Fig. 2 A), a complete marginal carina extending from the subhumeral fovea at side of the elytra, antennomeres XI with a small ventral denticle, mesotibiae with a distinct apical spine in the male, and most importantly, the endophallus of the symmetric and robust aedeagus composed of a pair of elongate lateral sclerites ( Fig. 3 J; Besuchet 1979, fig. 2). According to Besuchet (1979: 283) and Nomura & Lee (1993: 5) this species has been associated with Lasius ants. The single male from Shanghai was collected under a stone with ants ( Fig. 4 A), unfortunately no specimen of the ant was collected.

Figures

FIGURE 2. Dorsal habitus of male. A. Batrisus sibiricus. B. Batriscenellus orientalis. Scale bars: 0.5 mm.

FIGURE 3. Diagnostic features of species (A, D, E – G. Batriscenellus xijiaogongyuan. B – C, H – I. Physomerinus pedator. J. Batrisus sibiricus). A – B. Head and pronotum. C. Metafemur. D. Abdominal tergite IV. E, H. Aedeagus, in lateral view. F, I. Aedeagus, in ventral view. G. Aedeagus, in axial view. J. Aedeagus, in dorsal view. Scales bars: 0.2 mm in A – D, 0.1 mm in E – J.

FIGURE 4. Collecting sites and habitats of the Pselaphinae in Shanghai. A. Collecting sites of Batriscenellus xijiaogongyuan (1), Batrisus sibiricus (2), Physomerinus pedator (3), and Batriscenellus orientalis (4). B. Habitat of Batriscenellus xijiaogongyuan. C. Habitat of Physomerinus pedator.