Stenus dabashanus, 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 : 79-81

Taxon classification Animalia Coleoptera Staphylinidae

Stenus dabashanus sp. n. Figs 12, 72-76

Type material.

Holotype. China: Shaanxi: ♂, glued on a card with labels as follows: "China: S-Shaanxi (Daba Shan), NW Pass 25km NW Zhenping, 32°01'N, 109°19'E, 2150 m, 11.VII.2001, M. Schülke leg. [C01-09]." "Holotype / Stenus dabashanus / Tang, Liu & Niu" [red handwritten label] (cSch). Paratypes. 1♂3♀♀, same data as for the holotype (1♀ in SHNU, rest in cSch); 1♀, Daba Shan creek vall., SE pass 20km NW Zhenping, 31°59'N, 109°22'E, 1680 m, 11.VII.2001, A. Smetana leg. (cSme); 1♀, Daba Shan creek vall., SE pass 25km NW Zhenping, 32°01'N, 109°19'E, 2150 m, 11.VII.2001, A. Smetana leg. (cSme).

Description.

Brachypterous; body reddish brown except interocular area of head and abdominal segments VIII–X blackish. Antennae, maxillary palpi and legs yellowish brown except antennal club infuscate.

BL: 2.9-3.8 mm, FL: 1.5-1.7 mm.

HW: 0.70-0.83 mm, PL: 0.50-0.60 mm, PW: 0.50-0.60 mm, EL: 0.50-0.63 mm, EW: 0.60-0.68 mm, SL: 0.31-0.38 mm.

Head 1.15-1.21 times as wide as elytra, interocular area with two deep longitudinal furrows, median portion convex, extending beneath the level of inner eye margins; punctures round, mostly well delimited, slightly larger and sparser on median area than those near inner margins of eyes, diameter of large punctures about as wide as basal cross section of antennal segment II; interstices faintly reticulated, 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 0.96-1.05 times as long as wide; disk uneven, with median longitudinal furrow throughout; punctures confluent, of similar size to large punctures of head; interstices reticulated, narrower than half the diameter of punctures everywhere.

Elytra 0.83-0.93 times as long as wide, disk moderately uneven with distinct longitudinal humeral impression, distinct postero-lateral impression and long sutural impression, suture moderately convex; punctures longitudinally confluent and slightly larger than those of pronotum; interstices faintly reticulated, narrower than half the diameter of punctures.

Legs with hind tarsi 0.73 times as long as hind tibiae, tarsomeres IV deeply bilobed.

Abdomen cylindrical; line-like paratergites present only in segment III, tergites and sternites totally fused in segment IV–VI, tergite VII without apical membranous fringe; punctures distinctly smaller than those of elytra, gradually becoming smaller posteriad; interstices smooth, wider than the diameter of punctures except some on tergites III and IV, which could be smaller.

Male. Sternite VII with week emargination at middle of posterior margin; sternite VIII (Fig. 72) with semi-circular emargination at middle of posterior margin; sternite IX (Fig. 73) with long apicolateral projections, posterior margin serrate. Aedeagus (Figs 75, 76) slender, apical sclerotized area triangular with a keel along the middle; expulsion clasps large, strongly sclerotized; parameres much longer than median lobe, with 9-10 setae on apico-internal margins.

Female. Sternite VIII slightly prominent at middle of posterior margin; spermatheca (Fig. 74) weekly sclerotized, basal porch large and spermathecal duct with multiple bends.

Distribution.

China (Shaanxi).

Remarks.

The species can be easily recognized by distinctly darkened abdominal tip and reticulated forebody.

Etymology.

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