Trisinus pharelatus Yin and Nomura

Yin, Zi-Wei, Nomura, Shûhei & Zhao, Mei-Jun, 2012, Batrisoplisus Raffray, 1908, a new synonymy of Trisinus Raffray, 1894 (Coleoptera, Staphylinidae, Pselaphinae), with description of three new Chinese species, Zootaxa 3222, pp. 61-68 : 64-65

Trisinus pharelatus Yin and Nomura , new species

( Figs. 2 , 4, 7, 10, 13)

Type material (53, 3♀♀). Holotype: CHINA: 3, labeled ‘ CHINA: Yunnan Prov. / Nabanhe N. R. / Bengganghani, Shanshenmiao / N22.08.450 E100.35.289 / 11.xi.2008, alt. 1,700 m / J.Y. Hu & L. Tang leg.’ ( SNUC). Paratypes: CHINA: 3, ♀, same data as the holotype; 3, ♀, same label data except ‘…Guomengshan Mt. / N22.14.385 E100.38.429 / 12.xi.2008, alt. 1,100 m’; 3, same label data except ‘…Xiaonuoyouxiazhai / N22.14.121 E100.37.090 / 20.xi.2008, alt. 950 m’; 3, ♀, same label data, except ‘…Manfei / N22.09.305 E100.41.291 / 18.xi.2008, alt. 620 m. ’ (all in SNUC).

Description. Male. Body ( Fig. 2 ) dark brown, elytra, abdomen and legs yellowish brown, tarsi and maxillary palpi lighter; body length 1.75–1.77 mm, body width 0.69–0.71 mm.

Head wider than long, nearly rectangular, roughly punctate, with distinct median sulcus; clypeus short, arcuately expanded anteriorly; frons parallel-sided; vertex weakly convex, vertexal foveae connected by U-shaped sulcus; postgenae slightly narrowed; gula with single median fovea. Eyes convex and ovoid. Antennae (Fig. 4) with antennomeres IX slightly denticulate laterally, X nearly pentagonal, expanded laterally, with two lateral hook-like protuberances. Maxillary palpi short, palpomeres I minute, II elongate, expanded at apical 2/3, III slightly longer than wide, subcylindrical, IV largest, fusiform.

Pronotum wider than long, angulate at apicolateral margins; discal longitudinal sulci located between median and lateral longitudinal sulci; both inner and outer pairs of basolateral foveae present. Elytra, meso- and metathorax similar to that of T. shaolingiger . Mesotibiae (Fig. 7) each with two tiny apical spines.

Abdomen covered with setae, tergite VIII transverse, sternite VIII broadened, sternite IX slightly expanded.

Aedeagus ( Figs. 10, 13 ) asymmetric; ventral lobe widest at middle in lateral view, curved leftward in ventral view; dorsal apophysis membranous.

Female. Similar to male except for the following: body larger, body length 2.00–2.02 mm, body width 0.68– 0.70 mm; antennomeres IX–X each slightly angulate externally, X without lateral hook-like spines.

Distribution. Southwest China: Yunnan Province.

Remarks. This species can be readily distinguished from the other Chinese species by the uniquely modified antennae and form of the aedeagus.

Etymology. The Latin word ‘ pharelatus ’ means ‘ornamented’, referring to the hook-like protuberances on antennomeres X.

Figures

FIGURES 1 – 2. Male habitus of Trisinus shaolingiger (1) and T. pharelatus (2). Scale bars: 0.5 mm.

FIGURES 9 – 14. Aedeagus of Trisinus shaolingiger (9, 12), T. pharelatus (10, 13) and T. shuixiuifer (11, 14). 9 – 11. Lateral view. 12 – 14 Ventral view. Scale bars: 0.1 mm.