Stenus paraflammeus, 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 : 69-72

Taxon classification Animalia Coleoptera Staphylinidae

Stenus paraflammeus sp. n. Figs 6, 41-46

Type material.

Holotype. China: Sichuan: ♂, glued on a card with labels as follows: "China: Sichuan Prov., Tianquan County, Erlangshan Mt., Yakou 3.6km, 29°31'N, 102°17'E, alt. 2600-2800 m, 11.VII.2012, Peng, Dai & Yin leg." "Holotype / Stenus paraflammeus / Tang Liu & Niu" [red handwritten label] (SHNU). Paratypes. 5 ♂♂4♀♀, same data as for the holotype (1pair in cPut, rest in SHNU); 1♂4♀♀, same data but 29°33'N, 102°18'E, alt. 2800-3000 m, 13.VII.2012, Peng, Dai & Yin leg. (SHNU); 3♂♂1♀, same data but 29°32'N, 102°18'E, alt. 2200-2300 m, 13.VII.2012, Peng, Dai & Yin leg. (SHNU); 1♂1♀, Erlangshan, 1600-2000 m, 29.VII.2006, Hu & Tang leg. (SHNU)

Description.

Brachypterous, reddish brown, head especially interocular area along the inner margins of eyes darker, abdomen moderately glossy. Antennae yellowish, club infuscate. Maxillary palpi yellowish. Legs reddish yellow, tarsomeres slightly infuscate.

BL: 4.4-4.7mm, FL: 2.0-2.3 mm.

HW: 0.90-1.00 mm, PL: 0.65-0.82 mm, PW: 0.72-0.85 mm, EL: 0.65-0.83 mm, EW: 0.83-0.96 mm, SL: 0.45-0.58 mm.

Head 1.06-1.08 times as wide as elytra; interocular area with two deep longitudinal furrows, median portion strongly convex, distinctly extending beyond the level of inner eye margins; punctures round, well delimited on the posterior areas of furrows and distinctly confluent on the rest parts especially on median portion, diameter of large punctures about as wide as medial cross section of 2nd antennal segment; interstices between punctures smooth, distinctly narrower than half the diameter of punctures. Paraglossa coniform.

Pronotum 0.90-0.96 times as long as wide; disk conspicuously uneven, with broad and deep median longitudinal furrow which begins from the anterior margin and ends at about basal 1/5, two deep impressions in anterior half each with an outer tubercle, two distinct impressions in about middle each with an inner tubercle, two deep impressions in posterior half each with an outer tubercle; punctures round and strongly confluent, mostly slightly smaller than those on frons; interstices smooth, much narrower than half the diameter of punctures except in median furrow, which is partially reticulated and broadly impunctate.

Elytra 0.85-0.89 times as long as wide; disk uneven with deep humeral impression, distinct postero-lateral impression and deep sutural impression, median portion between humeral impression and sutural impression distinctly convex; punctation irregular, punctures confluent, slightly larger than those on pronotum; interstices smooth, much narrower than half the diameter of punctures.

Legs with tarsomeres IV strongly 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 mostly round, becoming slightly smaller posteriad; interstices smooth on the basal four tergites and more or less sculptured on the rest tergites, narrower than half the diameter of punctures on basal three tergites and narrower than diameter of punctures on the following two tergites.

Male. Seventh sternite (Fig. 41) deeply impressed at posteromedian part with emargination along posterior margin of impression; sternite VIII (Fig. 42) with triangular emargination at middle of posterior margin; sternite IX (Fig. 43) with very long apicolateral projections, posterior margin with strong median projection. Aedeagus (Figs 45, 46) with median lobe broadest at about basal 1/5 and gradually tapering apicad, apical sclerotized area with an apical cuspidate projection; expulsion clasps large; parameres distinctly shorter than median lobe, slightly swollen at apical parts, each with 10-12 setae on apico-internal margins.

Female. sternite VIII entire; valvifers (Fig. 44) each with very long inner tooth on posterior margin, spermatheca undetected.

Distribution.

China (Sichuan).

Remarks.

This new species is closely related to Stenus flammeus and Stenus pseudoflammeus , but can be easily distinguished from the latter two species by its broader pronotum.

Etymology.

The specific name is derived from the similar appearance of Stenus flammeus .