Batraxis longicornis, Wang, Dan & Yin, Zi-Wei, 2016

Wang, Dan & Yin, Zi-Wei, 2016, New species and records of Batraxis Reitter (Coleoptera: Staphylinidae: Pselaphinae) in continental China, Zootaxa 4147 (4), pp. 443-465 : 449

Batraxis longicornis , new species

( Figs 3 B, 11A‒C, 14O, 15)

Type material (7 ƋƋ, 17 ♀♀). Holotype: CHINA: Ƌ, labeled ‘ CHINA: Yunnan, Baoshan City, Tengchong County, Mingguang Town , Zizhi village , 25°17'46"N, 98°47'58"E, 1610 m, 20.iv.2013, Dai, Song & Peng leg.’ ( SNUC) . Paratypes: CHINA: 6 ♂♂, 14 ♀♀, same label data as holotype ; 3 ♀♀, labeled ‘ China: Yunnan, Baoshan City, Baihualing, Baihua Village , near stream, 25°16'39"N, 98°47'53"E, 1220 m, 22.iv.2013, Dai, Song & Peng leg.’ ( SNUC) .

Diagnosis of male. Body almost glabrous, abdomen covered with sparse setae; frons with complete subantennal transverse sulcus; antennomeres IX as long as wide, XI lengthily elongate; pronotum with shallow median antebasal fovea and distinct basal impression; all tibiae slender; protrochanters protuberant ventrally, profemora simple, protibiae lacking protuberance, mesotibiae lacking apical spur; tergite IV with narrow basal sulcus, discal carinae relatively short, moderately close, with relatively short marginal carinae; aedeagus relatively elongate.

Description. Male ( Fig. 3 B). Body yellowish brown, length 2.02‒2.06 mm. Head rectangular, slightly longer than wide, HL 0.45‒0.47 mm, HW 0.43‒0.44 mm, vertex glabrous, apical margin of frons and clypeus sparsely pubescent; vertex moderately convex, with pair of distinct vertexal foveae; antennal tubercles low; frons flattened and broad, subantennal transverse sulcus complete, anterior margin of U-shaped vertexal sulcus merging with subantennal transverse sulcus and connecting foveae; each eye composed of about 30 facets; antennae relatively thin, antennomeres III–VII slightly elongate, VIII and IX as long as wide, X slightly transverse, XI largest and elongate, widest at basal third; median gular carina narrow, with two separated nude gular foveae. Pronotum slightly wider than long, PL 0.38 mm, PW 0.45‒0.47 mm, with shallow median antebasal fovea and complete basal impression. Elytra wider than long, EL 0.55 mm, EW 0.72‒0.74 mm, each elytron with two shallow foveae at base. Protrochanters protuberant at ventral margin ( Fig. 14 O). Abdomen slightly wider than long, AL 0.63‒0.66 mm, AW 0.65‒0.67 mm, slightly expanded at base; tergite IV (first visible tergite) sparsely pubescent, with narrow basal sulcus; discal carinae relatively short and close, extending to one-third of tergal length, width between carinae 0.25 mm at apices; marginal carinae extending to apical one-third of tergal length. Aedeagus ( Fig. 11 A‒C) 0.31 mm in length, relatively elongate, parameres distinctly exceeding apex of median lobe, apex flattened, each with three thick apical setae; endophallus with two pairs of symmetric, elongate sclerites and weakly sclerotized structures.

Female. Similar to male in general appearance; protrochanters simple; each eye composed of about 30 facets. Measurements: BL 2.04‒2.35 mm; HL 0.44‒0.47 mm; HW 0.43‒0.45 mm; PL 0.39‒0.42 mm; PW 0.40‒0.50 mm; EL 0.52‒0.65 mm; EW 0.74‒0.85 mm; AL 0.69‒0.81 mm; AW 0.66‒0.79 mm; width between discal carinae of tergite IV 0.25‒0.30 mm at apices.

Comparative notes. Batraxis longicornis can be readily separated from all other congeners by the strongly elongate antennomeres XI and form of the aedeagus.

Distribution. China: Yunnan ( Fig. 15 ).

Etymology. The specific epithet refers to the elongate antennomeres XI.

Figures

FIGURE 3. Dorsal habitus of Batraxis males. A. B. antennata. B. B. longicornis. Scale bars: 0.5 mm.

FIGURE 11. Aedeagi of Batraxis species. (A, B, D, E, G, H. in ventral view. C, F, I. in lateral view). A – C. B. longicornis. D – F. B. gesar. G – I. B. longithorax. Scale bars: 0.1 mm.

FIGURE 14. Legs of male Batraxis species. (A – F. Protibia. G. Mesotibia. H, I. Profemur. J – V. Protrochanter). A, K. B. gloriosa, population from Fujian. B, L. B. gloriosa, population from Zhejiang. C, H, P. B. gesar. D, T. B. ziyueae. E, U. B. bicolor, population from Yunnan. F, I, V. B. tibialis, population from Jiangxi. G, S. B. yifan. J. B. gloriosa, population from Hunan. M. B. gloriosa, population from Jiangxi. N. B. gloriosa, population from Guangxi. O. B. longicornis. Q. B. longithorax. R. B. nanlingensis. Scale bars: A ‒ I = 0.1 mm; J ‒ V = 0.05 mm.

FIGURE 15. Distribution of Batraxis species in China.