Stenus jindingianus, 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 : 62-65

Taxon classification Animalia Coleoptera Staphylinidae

Stenus jindingianus sp. n. Figs 2, 18-23

Type material.

Holotype. China: Sichuan: ♂, glued on a card with labels as follows: "China: Sichuan Prov., Emeishan Mt., Jinding, 1.35 km, 29°31'N, 103°20'E, alt. 2800-3000 m, 19.VII.2012, Peng, Dai & Yin leg." "Holotype / Stenus jindingianus / Tang, Liu & Niu" [red handwritten label] (SHNU). Paratypes. 1♂2♀♀, same data as for the holotype (SHNU); 1♂1♀, Emei Shan, 3000 m, 29°32'N, 103°21'E, 17.VII.1996, Smetana, Farkač & Kabátek leg. (cSme); 2♂♂, Emeishan, Jinding, 3020 m, 2.XI.1995, Uéno leg. (cWat); 2♂♂1♀, Emeishan, Taiziping, 2930 m, 2.XI.1995, Uéno leg. (cWat); 2♂♂, Emeishan, below Jinding, 3000 m, 5.X.1995, Nomura leg. (cWat).

Description.

Brachypterous; head broadly black along the inner eye margins, median portion dark brown or rarely black, labrum reddish brown, rest body parts reddish brown, elytra each with trace of yellow spot at humeral impression. Antennae, maxillary palpi and legs yellowish brown except antennal club infuscate.

BL: 3.1-3.3mm, FL: 1.6-1.7 mm.

HW: 0.73-0.76 mm, PL: 0.53-0.59 mm, PW: 0.58-0.62 mm, EL: 0.56-0.64 mm, EW: 0.68-0.71 mm, SL: 0.39-0.46 mm.

Head 1.03-1.07 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, slightly confluent, 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, much narrower than half the 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 0.91-0.95 times as long as wide, disk uneven, with broad median longitudinal furrow throughout, two shallow impressions in anterior half, two shallow impressions in about middle, two shallow impressions in posterior half; punctures confluent, of similar size to those of head; interstices smooth, narrower than half the diameter of punctures except those at the bottom of longitudinal furrow, which could be much larger.

Elytra 0.82-0.90 times as long as wide; disk moderately even with indistinct longitudinal humeral impression, indistinct postero-lateral impression and indistinct long sutural impression, suture moderately convex; punctation strongly and longitudinally confluent; interstices smooth, very narrow and ridge-like.

Legs with tarsomeres IV deeply bilobed.

Abdomen cylindrical; paratergites very narrow and punctate, present only in segment III, tergites and sternites totally fused in segment IV–VI, tergite VII without apical membranous fringe; punctures gradually becoming smaller posteriad, punctures of abdominal tergites III slightly larger than those of pronotum in average; interstices smooth except sometimes traces of reticulation presented at last three tergites, narrower than the diameter of punctures on tergites III–VI.

Male. Sternite VII (Fig. 18) with emargination at middle of posterior margin and a distinct impression before it; sternite VIII (Fig. 19) with semi-circular emargination at middle of posterior margin; sternite IX (Fig. 20) with very long apicolateral projections, posterior margin with distinct median projection. Aedeagus (Figs 21, 22) with apical sclerotized area triangular; expulsion clasps mediun in size; parameres as long as median lobe, slightly swollen at apical parts, each with 12-14 setae on apico-internal margins.

Female. Sternite VIII entire; spermatheca (Fig. 21) with basal duct strongly sclerotized, remining part of the spermathecal duct slightly sclerotized with multiple bends.

Distribution.

China (Sichuan).

Remarks.

The species can be distinguished from other related species except Stenus corniculus sp. n. by smaller body size and longitudinally confluent punctation of elytra. To distinguish from Stenus corniculus sp. n., see diagnoses of the latter.

Etymology.

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