Stenus pengzhongi, Tang, Liang, Liu, Si-Yu & Niu, Tong, 2016

Tang, Liang, Liu, Si-Yu & Niu, Tong, 2016, A revision of the Stenusflammeus group (Coleoptera, Staphylinidae) with descriptions of twelve new species, ZooKeys 595, pp. 57-83 : 59-62

Taxon classification Animalia Coleoptera Staphylinidae

Stenus pengzhongi sp. n. Figs 1, 13-17

Type material.

Holotype. China: Sichuan: ♂, glued on a card with labels as follows: "China: Sichuan Prov., Emei Shan, Xixiangchi, 29°33'N, 103°20'E, alt. 2100-2300 m, 21.VII.2012, Peng, Dai & Yin leg." "Holotype / Stenus pengzhongi / Tang, Liu & Niu" [red handwritten label] (SHNU). Paratypes. 1♂, same data as for the holotype (SHNU); 1♀, Mt. Emei, 17.VII.2003, Hu & Tang leg. (SHNU); 1♂3♀♀, Emei Shan, 29°33'39"N, 103°20'42"E, 1850m, 23.V.2011, sift04, V. Grebennikov (CNC).

Description.

Brachypterous; Head black, other body parts dark brown, each elytron with a large orange spot, which is about 3/5 as long as and 1/2 as broad as the respective elytron. Antennae yellowish brown, club infuscate, maxillary palpi and legs yellowish brown.

BL: 3.1-3.4mm, FL: 1.5-1.6 mm.

HW: 0.71-0.76 mm, PL: 0.54-0.58 mm, PW: 0.50-0.55 mm, EL: 0.53-0.58 mm, EW: 0.57-0.58 mm, SL: 0.40-0.42 mm.

Head 1.25-1.31 times as wide as elytra; interocular area with two deep longitudinal furrows, median portion convex, slightly extending beyond the level of inner eye margins; punctures round, mostly well delimited, slightly larger and sparser on median area than those near inner margins of eyes, diameter of large punctures about as wide as apical cross section of antennal segment II; interstices smooth, narrower than half to entire diameter of punctures except those along the midline of the convex median portion, which may be twice as wide as diameter of punctures. Paraglossa coniform.

Pronotum 1.05-1.08 times as long as wide; disk slightly uneven, with distinct median longitudinal furrow, which is about 3/5 as long as pronotum; punctures more or less confluent, slightly larger than those of head; interstices smooth, distinctly narrower than half the diameter of punctures except those at the actual middle of longitudinal furrow, which could be three times as wide as diameter of punctures.

Elytra 0.95-0.98 times as long as wide; disk relatively even; punctures more or less longitudinally confluent, slightly larger than those of pronotum; interstices smooth, distinctly narrower than half the diameter of punctures.

Legs with tarsomeres IV deeply bilobed.

Abdomen cylindrical; line-like paratergites present only in segment III, tergites and sternites totally fused in segment IV–VI, tergite VII without apical membra nous fringe; punctures mostly round, becoming slightly smaller posteriad; interstices smooth, mostly narrower than diameter of punctures.

Male. Sternite VIII (Fig. 13) with semi-circular emargination at middle of posterior margin; sternite IX (Fig. 14) with very long apicolateral projections, posterior margin with distinct median projection. Aedeagus (Figs 16, 17) slender; median lobe with apical sclerotized area semicircle; expulsion clasps large, strongly sclerotized; parameres extending a little beyond apex of median lobe, swollen at apical parts, each with 8-10 setae on apico-internal margins.

Female. Sternite VIII inconspicuously prominent at middle of posterior margin; sclerotized spermatheca (Fig. 15) with very complicated bends.

Distribution.

China (Sichuan).

Remarks.

The species can be distinguished from other related species by the following characters: body size smaller, surfaces of pronotum and elytra rather even and ratio of HW/EW larger.

Etymology.

This species is named in honor of Mr. Zhong Peng who collected some specimens of the new species.