Gabrius tortilis, Li, Liang, Schillhammer, Harald & Zhou, Hong-Zhang, 2010

Li, Liang, Schillhammer, Harald & Zhou, Hong-Zhang, 2010, Fourteen new species of the genus Gabrius Stephens, 1829 (Coleoptera: Staphylinidae: Philonthina) from China, Zootaxa 2572, pp. 1-24 : 19-20

12. Gabrius tortilis sp. n.

( Figs. 1 A–D)

Type material. Holotype: CHINA: Shaanxi: ɗ, Taibai Shan, 27.V.2005, 1800 m, leg. Zhou Hongzhang ( IZ- CAS). Paratypes: CHINA: Ningxia: ɗ, Liupan Shan, 2000 m, 21.VI.2008, leg. Zhou Haisheng & Zhao Zongzi (IZ-CAS); CHINA: Sichuan: ɗ, Baoxing: Longdong, 1796 m, 12.VIII.2003, leg. Wu Jie (IZ-CAS); 4 ɗɗ, Baoxing: Yaoqi Xiang: Mahuanggou, 2630 m, 2.X.1997, leg. Toshio Kishimoto ( CKT, NMW); CHINA: Yunnan: ɗ, 24–29.VI.1993, 50 km N Lijiang, Yulongshan Nat. Res., leg. E. Jendek & O. Sausa ( NMW); ɗ, Lijiang Naxi Aut. Co., E Yulongxue Shan, 30 km N, (27°09’N, 100°14’E), 2800–2900 m, 13.VIII.2003, leg.

D. W. Wrase [01] ( CSB); CHINA: Shaanxi: Ψ, Qinling Shan, 12 km SW Xunyangba, 1900–2250 m, 14– 18.VI.2000, leg. C. Holzschuh ( NMW); ɗ, Qinling Shan, Hua Shan Mt. N Valley, 118 km E Xian, 1200–1400 m, 18–20.VIII.1995, leg. M. Schülke ( CSB); CHINA: Hubei: ɗ, Daba Shan, pass E of Mt. Da Shennongjia, 12 km NW Muyuping (31°30’N, 110°21’E), 1950–2050 m, 22.VII.2001, leg. M. Schülke [C01-13E] ( CSB); CHINA: Xizang: ɗ, Diqing Aut. Pr. Deqin Co., Meili Xue Shan E-side 14 km W Deqin (28°27.47’N, 98°46.35’E), 2580 m, 11.VI.2005, leg. A. Smetana [C 158] ( CSO).

Description. Head and pronotum black, shining. Antennae and elytra black. Abdomen black with feebly blue reflex. Mandibles dark brown. Maxillary and labial palpi reddish-brown or dark brown. Legs blackbrown.

Body 8.32–8.98 mm long (HPL = 2.45–2.69 mm). Head of rounded quadrangular shape, 1.06–1.14 mm long, 0.90 mm wide (HW:HL = 0.79–0.85). Tempora 0.49 mm long, almost evenly rounded, sparsely and coarsely punctate; eyes small, slightly protruding, 0.33 mm long, 0.67 times as long as tempora. Dorsal surface of head with scattered, large setiferous punctures along lateral sides, vertex largely impunctate; entire head with distinct and profound microsculpture. Antennae moderately long, 1st segment long, slightly thickened towards apex, 3rd segment distinctly longer than 2nd, 4th–8th segments distinctly longer than wide, 9th– 10th segments almost as long as wide, last segment distinctly longer than wide, obliquely truncated.

Pronotum almost parallel-sided, 1.22–1.31 mm long, 0.98–1.06 mm wide, slightly wider than head (PW:HW = 1.09–1.18); dorsal rows each with six punctures, sublateral rows each with two punctures; entire surface with distinct and profound microsculpture of transverse waves.

Elytra 1.47–1.63 mm long, 1.55–1.63 mm wide, along sides 1.20–1.33 times as long as pronotum; densely and finely punctate, punctures separated by 1–2 times their diameter. Scutellum large, triangular, densely and finely punctate and pubescent.

Abdomen slightly narrowed posteriad, widest 1.39–1.55 mm, densely and finely punctate, punctures separated by less than one puncture diameter at base, gradually becoming slightly sparser toward apex of each tergite; surface between punctures with exceedingly fine and dense microsculpture of transverse striae; tergites III–VI with two basal lines, elevated area between basal lines almost impunctate.

Male. Sternite VIII with moderately wide, deep medio-apical emargination, filled by semi-membranous extension. Genital segment with styli of tergite IX simple, moderately setose apically. Sternite IX with large membranous middle portion, basal portion narrow and long, almost symmetrical, apical portion split apically into two pubescent lobes. Tergite X widely emarginate at apex.

Aedeagus similar to that of G. japonicus , but apical portion of median lobe strongly contorted dorsad to right side in ventral view ( Figs. 1 A, D); branches of paramere widely separated from each other, lacking strong setae apically, face adjacent to median lobe with much more sensory peg setae closely arranged along basal portion of lateral margin and medio-apical margin of paramere ( Fig. 1 C).

Female. Sternite VIII subrounded at apex, without medio-apical emargination. Genital segment with styli of tergite IX similar to that of male. Tergite X triangular, conically narrowed toward subacuate apex.

Remarks. Gabrius tortilis sp. n. is closely related to G. japonicus Shibata, 1991 in having branches of paramere without strong apical setae. It may be distinguished from G. japonicus by the slightly different apical portion of the median lobe ( Figs. 1 D, 8K) and much more peg setae on the underside of paramere.

Distribution. The species is common in SW-China (Shaanxi, Ningxia, Sichuan, Hubei and Yunnan).

Etymology. The specific epithet is derived from the Latin word tortilis (contorted), and refers to the twisted apical portion of the median lobe of the aedeagus.

Figures

FIGURE 1. Gabrius tortilis sp. n. A, aedeagus, ventral view; B, median lobe of aedeagus (paramere removed), lateral view; C, underside of paramere; D, apical portion of median lobe, ventral view. Gabrius yaanensis sp. n. E, aedeagus, ventral view; F, median lobe of aedeagus (paramere removed), lateral view; G, underside of paramere; H, apical portion of median lobe, ventral view. Gabrius batangensis sp. n. I, aedeagus, ventral view; J, median lobe of aedeagus (paramere removed), lateral view; K, underside of paramere; L, apical portion of median lobe, ventral view. Scale bars 0.5 mm.