Stenus tonghanggangus Tang, Puthz & Yue

Tang, Liang, Puthz, Volker & Yue, Yan-Li, 2016, A study on the genus Stenus Latreille from Tianmushan Mountain Chain of East China (Coleoptera, Staphylinidae), Zootaxa 4171 (1), pp. 139-152 : 142-143

4. Stenus tonghanggangus Tang, Puthz & Yue , new species

( Figs. 2 , 9–13 )

Type material. Holotype. China : Zhejiang: ♂, glued on a card with labels as follows: “ China: Zhejiang Prov., Anji County, Longwangshan , Tonghanggang, 30°25'N 119°26'E, alt. 1480 m, 10.VI.2012, Hu & Yin leg.” “ Holotype / Stenus tonghanggangus / Tang, Tu & Puthz ” [red handwritten label] ( SHNU) . Paratypes. 1♂ 2♀♀, same data as for the holotype ( SHNU, cPut).

Description. Brachypterous. Head black, pronotum and abdomen dark brown, elytra brownish. Antennae yellowish brown, club infuscate, maxillary palpi and legs yellowish brown.

BL: 3.2–4.2mm, FL: 1.7–1.9 mm.

HW: 0.74–0.82 mm, PL: 0.56–0.65 mm, PW: 0.52–0.61 mm, EL: 0.56–0.63 mm, EW: 0.59–0.68 mm, SL: 0.41–0.46 mm.

Head 1.19–1.27 times as wide as elytra; interocular area with two deep longitudinal furrows, median portion convex, reaching 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 apical cross section of antennal segment II; interstices smooth, narrower than half the diameter of punctures except those along the midline of the convex median portion, which may be slightly wider than diameter of punctures. Paraglossa oval.

Pronotum 1.06–1.10 times as long as wide; disk slightly uneven, with indistinct median longitudinal furrow; punctures distinctly confluent, similar size to those of head; interstices smooth and rugae-like, narrower than diameter of punctures.

Elytra 0.92–0.94 times as long as wide; disk relatively even, with longitudinal humeral impression, posterolateral impression and sutural impression indistinct; punctures and interstices similar to those of pronotum.

Legs with tarsomeres IV deeply bilobed.

Abdomen cylindrical; segments III–VI without paratergites, rudimentary lateral border present, tergite VII with indistinct apical membranous fringe; punctures round to elliptic, becoming slightly smaller posteriad; interstices partially and sometimes indistinctly sculptured on tergites III and IV, distinctly sculptured on tergites V and VI, reticulated on the other tergites, mostly narrower than half the diameter of punctures on basal three tergites.

Male. Sternite VIII ( Fig. 9 ) with shallow emargination at middle of posterior margin; sternite IX ( Fig. 10 ) with very long apicolateral projections, posterior margin serrate. Aedeagus ( Figs. 12, 13 ) slender; apical sclerotized area of median lobe wide and very short; expulsion clasps large, strongly sclerotized; parameres much longer than median lobe, swollen at apical parts, each with 15–18 setae on apico-internal margins.

Female. Sternite VIII slightly prominent at middle of posterior margin; spermatheca ( Fig. 11 ) strongly sclerotized except weakly sclerotized collum and capsule.

Distribution. China (Zhejiang).

Remarks. The species belongs to Stenus indubius group and is similar to S. tianmushanus sp. nov. and S. zhujianqingi Tang, Li & Wang, 2012 , but can be distinguished from the latter two by the smaller size, less confluent punctation of forebody and shorter elytra.

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

Figures

FIGURES 1 – 3. Habitus 1 Stenus tianmushanus 2 S. tonghanggangus 3 S. pseudomicuba. Scales = 1 mm.

FIGURES 9 – 13. Stenus tonghanggangus 9 male sternite VII 10 male sternite IX 11 valvifers and spermatheca 12, 13 aedeagus. Scale bars = 0.25 mm.