Stenus zhujianqingi Tang, Li & Huang

Tang, Liang, Li, Li-Zhen & Wang, Jun-Wang, 2012, Two additional new species of the Stenus indubius group (Coleoptera, Staphylinidae) from China, ZooKeys 215, pp. 41-54 : 44-45

Stenus zhujianqingi Tang, Li & Huang sp. n. Figs 2, 6

Type material.

Holotype ♂:"China: Zhejiang Prov., Lin’an City, Qingliangfeng N. R., 1750m, 9.VIII.2011, Zhu Jian-Qing leg." "Holotype / Stenus zhujianqingi / Tang & Li" [red handwritten label] (SHNU). Paratypes. 13♂♂, 2♀♀, same data as for the holotype (1 pair in cPut, rest in SHNU); 4♂♂, 1♀, Qingliangfeng N. R., Longtangshan, 1100m, 12.V.2012, Chen, Ma & Zhao leg. (SHNU).

Description.

Brachypterous; body entirely black, anterior margin of labrum brownish, maxillary palpi yellowish brown, antennae and legs reddish brown.

BL: 4.0-4.3 mm; FL: 2.0-2.2 mm.

HW: 0.87-0.98 mm, PL: 0.71-0.84 mm, PW: 0.63-0.71 mm, EL: 0.74-0.82 mm, EW: 0.77-0.86 mm, SL: 0.53-0.64 mm.

Head 1.13-1.18 times as wide as elytra; interocular area with deep longitudinal furrows, median portion convex, not quite extending to 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, mostly much smaller than half the diameter of punctures. Antennae, when reflexed, not quite reaching posterior margin of pronotum; relative length of antennal segments from base to apex as 10.5: 7.5: 17.5: 10.5: 10: 7: 6.5: 5: 5: 5.5: 7.5. Paraglossa oval.

Pronotum 1.09-1.29 times as long as wide; disc with shallow short median longitudinal furrow, two indistinct impressions in anterior half, indistinct transverse impression in the middle, and two indistinct impressions in posterior half; punctures smaller than those of head, rugose and confluent; interstices smooth, slightly broader than diameter of punctures.

Elytra 0.95-1.00 times as long as wide, lateral margins with slight concavity before the middle; disc uneven with shallow longitudinal humeral impression, shallow sutural impression and shallow postero-lateral impression; suture convex; punctation and interstices similar to those of pronotum, but more rugose and confluent.

Hind tarsi 0.72 times as long as hind tibiae, tarsomeres IV distinctly bilobed.

Abdomen cylindrical; segments III–VI with tergites and sternites completely fused, without paratergites or sutures; tergite VII with palisade fringe; punctures on abdominal tergites III–VIII round to elliptic, gradually becoming smaller posteriad, punctures of tergite III large, of similar size as those of head; interstices smooth, mostly smaller than half the diameter of punctures.

Male. Sternite VII with posteromedian portion slightly flattened; sternite VIII (Fig. 6A) with shallow emargination at middle of posterior margin; sternite IX (Fig. 6B) with very long apico-lateral projections, posterior margin serrate; tergite X (Fig. 6C) with posterior margin slightly emarginated. Aedeagus (Figs 6D, 6E) with minute setae at sclerotized apex of median lobe; expulsion hooks (Fig. 6G) very large; parameres extending distinctly beyond apex of median lobe, a little folded at apical third, with about 17 setae on inner side (Fig. 6F).

Female. Abdomen broader than in male; sternite VIII (Fig. 6H) inconspicuously prominent at middle of posterior margin; tergite X (Fig. 6I) broader than in male; sclerotized spermatheca as in Figs 6J, 6K.

Distribution.

China (Zhejiang Province: Qingliangfeng N. R.).

Biological notes.

All the specimens were collected by shifting leaves in coniferous and broad-leaved mixed forest.

Diagnoses.

This species resembles Stenus paradecens Tang & Li, 2005 and Stenus guniujiangensis Tang & Li, 2005, but can be distinguished from both species by the rugose and confluent punctation of the pronotum and elytra. In addition, it also differs from Stenus paradecens by larger size and from Stenus guniujiangensis by longer elytra (see measurements in the modified key).

Etymology.

This species is named in honor of Mr. Jian-Qing Zhu, who collected most of the specimens of the new species.

To accommodate the new species, the recently published key to the Chinese species of the Stenus indubius group ( Tang and Li 2012) is modified at couplets 2 and 5 as follows: