Stenus wuyanlingus Liu, Tang & Luo

Liu, Sheng-Nan, Tang, Liang & Luo, Rong-Ting, 2017, Notes on the Stenuscirrus group of Zhejiang, East China, with descriptions of two new species (Coleoptera, Staphylinidae), ZooKeys 684, pp. 75-84 : 75-77

Stenus wuyanlingus Liu, Tang & Luo sp. n. Figs 1, 2, 7-13

Type material.

CHINA: Zhejiang: Holotype: ♂, glued on a card with labels as follows: "China: Zhejiang Prov. Taishun County, Wuyanling, 27°42'N, 119°41'E, alt. 1550 m. 6.V.2012, ZHU Jian-Qing leg". "Holotype / Stenus wuyanlingus / Liu & Tang" [red handwritten label] (SHNU). Paratypes: 6♂♂5♀♀, same data as for the holotype. (1♂1♀ in cPut, remainder in SHNU).

Description.

Brachypterous. Head black, pronotum and abdomen blackish brown, elytra light brown with median portion more or less lighter. Antennae, maxillary palpi and legs yellowish brown except antennal club infuscate. Labrum reddish brown.

BL: 2.7-3.1 mm, FL: 1.4-1.6 mm. HW: 0.63-0.71 mm, PL: 0.45-0.49 mm, PW: 0.43-0.51 mm, EL: 0.44-0.52 mm, EW: 0.48-0.61 mm, SL: 0.32-0.40 mm.

Head 1.21-1.30 times as wide as elytra; interocular area with two deep longitudinal furrows, median portion convex, slightly extending a little beneath the level of inner eye margins, with a impunctate line along midline; punctures round, larger and sparser in median portion than those near inner margins of eyes, diameter of large punctures about as wide as apical cross section of antennal segment II; interstices between punctures distinctly reticulated, varied from narrower than half the diameter of punctures to a little narrower than diameter of punctures except those along the midline of convex median portion, which may be slightly wider than diameter of punctures. Paraglossae oval.

Pronotum 0.94-1.04 times as long as wide; disk uneven, with distinct median longitudinal furrow almost throughout; punctures confluent, varied in size, mostly smaller than large punctures of head; interstices reticulated, narrower than diameter of punctures except those in median area, which may be much wider than diameter of punctures.

Elytra 0.81-0.95 times as long as wide; disk with shallow sutural impression and humeral impression; punctures confluent, slightly larger than those on pronotum in average; interstices rarely reticulated, narrower 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 segment IV–VI, posterior margin of tergite VII with indistinct palisade fringe; punctation round to elliptic, gradually becoming smaller and sparser 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 VII (Fig. 7) with inconspicuous emargination at middle of posterior margin; sternite VIII (Fig. 8) with shallow emargination at middle of posterior margin; sternite IX (Fig. 9) with long apicolateral projections, posterior margin serrate. Aedeagus (Figs 10-11) widest at basal third and tapering towards the apex; median longitudinal bands each with ventral band very long, straight, narrowed apically; lateral longitudinal bands short; expulsion clasps each with anterior plate distinctly separated from the posterior plate, rounded apically, posterior plate pointed posteriorly; copulatory tube moderately long, rather stout, with basal chamber submembranous, main tube distinctly divided into basal tube and apical tube, the basal tube gently constricted near the middle, apical tube very thin; parameres longer than median lobe, each with 8-11 setae on apico-internal margins.

Female. Sternite VIII (Fig. 12) with posterior margin weakly pointed at middle; spermatheca (Fig. 13) strongly sclerotized, spermathecal duct with multiple bends.

Distribution.

China (Zhejiang).

Remarks.

The new species can be easily recognized among Chinese members of the group by the smaller size and reticulations of head and pronotum. It can be distinguished from other species by its sparser punctation along in median area of head and pronotum, and the lighter color of elytra.

Etymology.

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