Stenus emeishanus Tang, Liu & Dong, 2018

Tang, Liang, Liu, Sheng-Nan & Dong, Xin-Yu, 2018, Seven new species of the Stenus cirrus group (Coleoptera, Staphylinidae) from Sichuan, Southwest China, Zootaxa 4425 (3), pp. 527-540 : 533-534

Stenus emeishanus Tang, Liu & Dong , new species

(Figs 4, 28–33)

Material examined. Holotype: ♂, glued on a card with labels as follows: “ China: Sichuan Prov., Emeishan Mt., Xianfeng Temple , 29°33'N, 103°21'E, alt. 1550–1700 m, 25.VII.2012, Peng, Dai & Yin leg” . “Holotype / Stenus emeishanus / Tang, Liu & Dong” [red handwritten label] (SHNU). Paratypes: 2♂♂ 6♀♀, same data as for the holotype. ( SHNU, cPut) ; 1♀, Hongchunping Temple , 29°33'N, 103°22'E, alt. 1100m, 27.VII.2012, Peng, Dai & Yin leg. ( SHNU) ; 1♂, Wannian , alt. 1050m, 19–30.III.1999, W. Schawaller leg. ( SMNS).

Description. Brachypterous; head blackish, pronotum and elytra brownish, abdomen dark brown, each elytron with an elongated orange spot near lateral margin. Antennae, maxillary palpi and legs yellowish brown except antennal club infuscate. Labrum reddish brown.

BL: 3.7–4.9 mm, FL: 1.8–2.1 mm.

HW: 0.78–0.86 mm, PL: 0.62–0.67 mm, PW: 0.58–0.65 mm, EL: 0.67–0.73 mm, EW: 0.72–0.80 mm, SL: 0.50–0.56 mm.

Head 1.04–1.11 times as wide as elytra; interocular area with two deep longitudinal furrows, median portion convex, reaching the level of inner eye margins; punctures round, distinctly larger on median portion than those near inner margins of eyes, diameter of large punctures slightly wider than apical cross section of antennal segment II; interstices smooth, distinctly narrower than half the diameter of punctures. Paraglossae oval.

Pronotum 1.01–1.07 times as long as wide; disk relatively even, with indistinct median longitudinal furrow; punctures confluent, varied in size, slightly larger than those of head; interstices smooth, much narrower than half the diameter of punctures except for those along the midline, which may be as wide as the diameter of punctures.

Elytra 0.92–0.95 times as long as wide; disk relatively even with shallow impression along the inner side of elytral spot; punctures slightly confluent, of similar size to those of pronotum; interstices smooth, distinctly smaller than half the diameter of punctures.

Legs with tarsomeres IV strongly bilobed.

Abdomen cylindrical; paratergites very narrow with few punctures, present only in segment III, tergites and sternites totally fused in segments IV–VI, posterior margin of tergite VII with indistinct apical membranous fringe; punctation of tergites III–VIII sparse and shallow, gradually becoming smaller posteriad; interstices smooth, mostly wider than diameter of punctures except those on basal impressions of tergites III–V, which may be distinctly narrower than half the diameter of punctures.

Male. Sternite VIII ( Fig. 28 ) with shallow emargination at middle of posterior margin; sternite IX ( Fig. 29 ) with long apicolateral projections, posterior margin serrate. Aedeagus ( Fig.30–31 ) with apical sclerotized portion triangular and roundly projected at apex; expulsion clasps large, strongly sclerotized; parameres longer than median lobe, each with 9–11 setae on apico-internal margins.

Female. Sternite VIII ( Fig. 32 ) entire; sclerotized spermatheca ( Fig. 33 ) simple consisting of basal duct, swollen spermatheca duct.

Distribution. China (Sichuan).

Remarks. The new species share the same appearance with S. cooterianus Puthz, 2003 from Fujian, and the identification of them should be based on dissection and the information of locality.

Etymology. The specific name is derived from the type locality of this species.

Figures

FIGURES 28–33. Stenus emeishanus. 28 male sternite VIII 29 male sternite IX 30, 31 aedeagus 32 female sternite VIII 33 valvifers and spermatheca. Scale bars: 0.25 mm.