Stenus liuyixiaoi, 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 : 101-103

Stenus liuyixiaoi sp. n. Figs 5, 6, 19-24

Material examined.

CHINA: Guizhou: Holotype: ♂, glued on a card with labels as follows: "China: N. Guizhou, Libo County Maolan N.R., Bizuo, 25°16'59"N, 106°03'18"E, 587 m, 28.iv.2017, mixed leaf litter, sifted, Jiang, Jiang, Hu, Liu & Zhang leg.". "Holotype / Stenus liuyixiaoi / Liu, Tang & Luo" [red handwritten label] (SHNU). Paratypes: 6♂♂9♀♀, same data as for the holotype (SHNU, cPut); 2♀♀, Maolan N.R., Dongdai, 25°17'51"N, 107°57'15"E, 808 m, 22.iv.2017, mixed leaf litter, sifted, Jiang, Jiang, Hu, Liu & Zhang leg. (SHNU); 4♂♂3♀♀, Maolan N.R., Dongdai, 25°17'58"N, 107°57'06"E, 874 m, 25.iv.2017, mixed leaf litter, sifted, Jiang, Jiang, Hu, Liu & Zhang leg. (SHNU); 1♂2♀♀, Dongdai, 25°17'13"N, 107°56'23"E, 792 m, 24.iv.2017, mixed leaf litter, sifted, Jiang, Jiang, Hu, Liu & Zhang leg. (SHNU).

Diagnosis.

The new species is characterized by large body size (4.2-5.8 mm) and relatively sparse punctation of the entire body, especially of the abdominal tergites.

Description.

Macropterous; body blackish, each elytron with a large yellow spot near its lateral margin. Antennae (except the infuscate club), maxillary palpi, and legs yellowish brown. Labrum reddish brown. BL: 4.2-5.8 mm, FL: 2.0-2.6 mm. HW: 0.77-0.96 mm, PL: 0.64-0.78 mm, PW: 0.61-0.72 mm, EL: 0.90-1.07 mm, EW: 0.82-1.01 mm, SL: 0.72-0.86 mm.

Head 0.93-1.03 times as wide as elytra, pronotum 1.06-1.13 times as long as wide, elytra 1.03-1.12 times as long as wide.

Other external characters as in S. zhangyuqingi sp. n., except that the punctation of the pronotum and abdomen is slightly sparser.

Male. Sternite VIII (Fig. 19) with shallow emargination at middle of posterior margin; sternite IX (Fig. 20) with long apicolateral projections, posterior margin serrated. Aedeagus (Figs 21-22) with triangular apical sclerotized portion and convex apex; internal structures: sclerotized expulsion clasps large, median ventral band long, narrow, lateral bands short; copulatory tube long, weakly curved in the middle; parameres longer than median lobe, swollen at apical parts, each with 11-13 setae on apicointernal margins.

Female. Sternite VIII as in Fig. 23; spermatheca (Fig. 24) strongly sclerotized with

spermathecal duct very coiled.

Distribution. China (Guizhou).

Remarks. The new species is closely related to S. zhangyuqingi sp. n., but may be distinguished from the latter by the relatively sparser punctation of pronotum and abdomen. It is also very similar to S. guangxiensis Rougemont, 1984, from which it is distinguished only based on the sexual characters.

Etymology. This species is named in honor of Mr. Yi-Xiao Liu who collected some specimens of the new species.

Key to species of the Stenus cirrus group of Guizhou