Stenus damingshanus Liu and Tang

Liu, Sheng-Nan & Tang, Liang, 2017, Seven new species of the Stenus cirrus group (Coleoptera, Staphylinidae) from Guangxi, South China, Zootaxa 4268 (2), pp. 238-254 : 244-245

Stenus damingshanus Liu and Tang , new species

( Figs 7, 8 , 41–48)

Type material. CHINA: Guangxi: Holotype: ♂, Mt. Damingshan , 23°23'N 108°28'E, alt. 700m. 1.VIII.2012, HU Jia-Yao & SONG Xiao-Bin leg. ( SHNU) . Paratupes : 10♂♂ 9♀♀, same data as for the holotype ( SHNU) ; 1♂ 1♀, same data as for the holotype (cPut) ; 6♂♂ 7♀♀, same data, but 23°23'N 108°29'E, alt. 1200m. 28.VIII.2012, HU Jia-Yao & SONG Xiao-Bin leg. ( SHNU) .

Description. Brachypterous; body brownish black with head slightly darker and abdomen slightly lighter. Antennae, maxillary palpi and legs yellowish brown except antennal club infuscate. Labrum reddish brown.

BL: 3.7–4.5 mm, FL: 1.6–1.9 mm.

HW: 0.70–0.83 mm, PL: 0.50–0.61 mm, PW: 0.52–0.61 mm, EL: 0.54–0.67 mm, EW: 0.54–0.74 mm, SL: 0.41–0.48 mm.

Head 1.11–1.31 times as wide as elytra; interocular area with two deep longitudinal furrows, median portion convex, slightly extending beyond the level of inner eye margins, with a impunctate line along midline; punctures round, larger and sparser on 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 smooth, narrower than half to diameter of punctures except those along the midline of the posterior median portion, which may be 1.5 times as wide as diameter of punctures. Paraglossae oval.

Pronotum 0.93–1.00 times as long as wide, disk relatively even, with very shallow and indistinct median longitudinal furrow along the middle; punctures round and moderately confluent, about the same size to those of head; interstices smooth, narrower than half the diameter of punctures except for those at the actual middle of longitudinal furrow, which could be wider than the diameter of punctures.

Elytra 0.84–1.00 times as long as wide, disk relatively even; punctures elliptic and more or less confluent, slightly larger than those on pronotum; interstices smooth, distinctly narrower than half the diameter of punctures.

Legs with tarsomeres IV strongly bilobed.

Abdomen cylindrical; paratergites very narrow and almost impunctate, present only in segment III, tergites and sternites totally fused in segments IV–VI, posterior margin of tergite VII with indistinct palisade fringe; punctures 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 could be distinctly narrower than half the diameter of punctures.

Male. Sternite VIII (Fig. 41) with shallow emargination at middle of posterior margin; sternite IX (Fig. 43) with long apicolateral projections, posterior margin serrate; tergite X (Fig.42) with posterior margin convex. Aedeagus (Fig. 44) with apical sclerotized area roundly projected at apex; expulsion clasps large; parameres distinctly longer than median lobe, slightly swollen in apical part, with 8-10 setae on apico-internal margins.

Female. Sternite VIII (Fig. 46) inconspicuously prominent at middle of posterior margin; tergite X (Fig. 47) with posterior margin truncate; spermatheca (Fig. 48) sclerotized with spermatheca duct very coiled.

Distribution. China (Guangxi).

Remarks. In general appearance the new species is similar to S. fellowesi Pan, Tang & Li 2012 from Hainan, but can be easily distinguished from the latter by the presence of paratergites on abdominal tergite III which is obsoleted in S. fellowesi .

Etymology. The specific name is derived from ‘Damingshan’, the type locality of this species.

Figures

FIGURES 7 – 8. Dorsal habitus of Stenus damingshanus sp. n. Scale bars: 1 mm.