Stenus zhangyuqingi, Liu, Sheng-Nan, Tang, Liang & Luo, Yong-Ting, 2017

Liu, Sheng-Nan, Tang, Liang & Luo, Yong-Ting, 2017, Three new species of the Stenuscirrus group from Guizhou, southwest China (Coleoptera, Staphylinidae), ZooKeys 716, pp. 95-103 : 97-101

Stenus zhangyuqingi sp. n. Figs 3, 4, 13-18

Material examined.

CHINA: Guizhou: Holotype: ♂, glued on a card with labels as follows: "China: N. Guizhou, Libo County Maolan N.R., Dongdai, 25°17'13"N, 107°56'23"E, 792 m, 24.iv.2017, mixed leaf litter, sifted, Jiang, Jiang, Hu, Liu & Zhang leg.". "Holotype / Stenus zhangyuqingi / Liu, Tang & Luo" [red handwritten label]. Paratypes: 4♂♂5♀♀, same data as for the holotype. (SHNU, cPut).

Diagnosis.

The new species is the most characteristic of the group characterized by the largest body, longer than 4.2 mm, a broad head up to 0.83-0.96 mm, and a shallower and narrower median longitudinal furrow of the pronotum than the other two species in this paper.

Description.

Macropterous; body blackish, each elytron with an elongated yellow spot near lateral margin. Antennae (except the infuscate club), maxillary palpi, and legs yellowish brown. Labrum reddish brown. BL: 4.2-5.1 mm, FL: 2.1-2.5 mm. HW: 0.83-0.96 mm, PL: 0.64-0.79 mm, PW: 0.61-0.69 mm, EL: 0.84-1.00 mm, EW: 0.78-0.93 mm, SL: 0.68-0.79 mm.

Head 1.03-1.13 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 and more or less confluent, larger and sparser on median portion than those near inner margins of eyes, diameter of large punctures larger than apical cross-section of antennal segment II; interstices between punctures smooth, much narrower than half the diameter of punctures except those along the midline of the median portion, which may be as wide as half the diameter of punctures. Paraglossae oval.

Pronotum 1.02-1.15 times as long as wide; disk with impressions, with a shallow and narrow median longitudinal furrow; punctures round and moderately confluent, variable in size, on average larger than those of head; interstices smooth, much narrower than half the diameter of punctures except for those along the middle of posterior half pronotum, which may be as wide as the diameter of punctures.

Elytra 1.07-1.16 times as long as wide; disk smooth; punctures round, moderately confluent, slightly larger than those on pronotum; interstices smooth, distinctly smaller than half the diameter of punctures.

Legs with tarsomeres IV strongly bilobed.

Abdomen cylindrical; paratergites very narrow and almost impunctate, visible only in segment III, tergites and sternites totally fused in segments IV–VI, posterior margin of tergite VII with apical membranous fringe; punctation of tergites III–VIII sparse and shallow, gradually becoming smaller posteriorly; interstices smooth, narrower than half the diameter of punctures on tergite III, narrower than half the diameter to diameter of punctures on tergites III and IV.

Male. Sternite VIII (Fig. 13) with shallow emargination at middle of posterior margin; sternite IX (Fig. 14) with long apicolateral projections, posterior margin ser rate. Aedeagus (Figs 15-16) with apical sclerotized portion triangular, convex at apex; internal structures: sclerotized expulsion clasps long, median ventral band long, narrow, dorsal bands long, lateral bands short; copulatory tube rather short, the main tube weakly curved near the middle; parameres longer than median lobe, slightly swollen in apical part, each with 10-12 setae on apicointernal margins.

Female. Sternite VIII as in Fig. 17; sclerotized spermatheca (Fig. 18) with spermathecal duct very coiled.

Distribution.

China (Guizhou).

Remarks.

The new species is closely related to S. guangxiensis Rougemont, 1984 from Zhejiang, Anhui, and Guangxi, as well as to S. liuyixiaoi sp. n., but can be easily distinguished from them by the narrower elytra (in the other two species, HW similar to or distinctly smaller than EW) and different sexual characters.

Etymology.

This species is named in honor of Mr. Yu-Qing Zhang who collected some of the specimens of the new species.