Stenus punctidorsus, 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 : 68-69

Taxon classification Animalia Coleoptera Staphylinidae

Stenus punctidorsus sp. n. Figs 5, 36-40

Type material.

Holotype. China: Sichuan: ♂, glued on a card with labels as follows: "China: Sichuan Prov., Erlangshan Mt., 29°32'N, 102°18'E, alt. 2800-3000 m, 13.VII.2012, Peng, Dai & Yin leg." "Holotype / Stenus punctidorsus / Tang, Liu & Niu" [red handwritten label] (SHNU). Paratypes. 1♂, Ya’an Pref., Tianquan Co., E Erlang Shan Pass, 2900 m, 9 km SE Luding, 29°52'N, 102°18'E, Gesiebe, 22.Vi.1999, leg. M. Schülke (cSch).

Description.

Brachypterous; Body reddish brown except head with interocular area blackish, each elytron with a very vague and inconspicuous small spot. Antennae, maxillary palpi and legs yellowish brown except antennal club infuscate.

BL: 3.4-3.9 mm, FL: 1.8-1.9 mm.

HW: 0.73-0.83 mm, PL: 0.58-0.63 mm, PW: 0.57-0.60 mm, EL: 0.61-0.67 mm, EW: 0.65-0.73 mm, SL: 0.45-0.50 mm.

Head 1.13-1.15 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, more or less confluent, almost the same size, diameter of 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 slightly narrower than diameter of punctures. Paraglossa coniform.

Pronotum 1.02-1.05 times as long as wide; disk uneven, with broad median longitudinal furrow throughout, two impressions in anterior half each with an small outer tubercle, two impressions in about middle each with an inner tubercle, two deep impressions in posterior half each with an larger outer tubercle; punctures confluent, slightly smaller than 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 0.92-0.94 times as long as wide; disk moderately uneven with distinct longitudinal humeral impression, distinct postero-lateral impression and long sutural impression, suture moderately convex; punctation and interstices similar to those of pronotum, except punctures slightly larger.

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 round, becoming slightly smaller posteriad; interstices smooth, narrower than half the diameter of punctures on tergite III–VI.

Male. Sternite VII (Fig. 36) impressed at posteromedian part with emargination along posterior margin of impression; sternite VIII (Fig. 37) with triangular emargination at middle of posterior margin; sternite IX (Fig. 38) with very long apicolateral projections, posterior margin with distinct median projection. Aedeagus (Figs 39, 40) with median lobe paralleled on sides, apical sclerotized area with a narrow and long apical projection; expulsion clasps large; parameres distinctly longer than median lobe, swollen at apical parts, each with 19-22 setae on apico-internal margins.

Female. Unknown.

Distribution.

China (Sichuan).

Remarks.

The new species is characterized by large and dense punctation of entire body especially of abdominal tergites.

Etymology.

The specific name is derived from the dense punctation of abdominal tergites.