Gabrius yaanensis, 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 : 20-21

13. Gabrius yaanensis sp. n.

( Figs. 1 E–H)

Type material. Holotype: CHINA: Sichuan: ɗ, Yaan Pref. Tianquan Co., E Erlang Shan pass, 9 km SE Luding (29°52’N, 102°18’E), 2900 m, 20–22.VI.1999, leg. D. W. Wrase ( CSB). Paratypes: CHINA: Sichuan: 4ΨΨ, same data as holotype ( CSB, NMW).

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. Legs black-brown.

Body 6.94–8.08 mm long (HPL = 2.45–2.69 mm). Head of rounded quadrangular shape, 1.06–1.22 mm long, 0.90–0.98 mm wide (HW:HL = 0.79–0.85). Tempora 0.49 mm long, almost evenly rounded, sparsely and coarsely punctate; eyes small, slightly protruding, 0.25–0.33 mm long, 0.50–0.67 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 of mesh. Antennae moderately long, 1st segment long, slightly thickened towards apex, 3rd segment distinctly longer than 2nd, 4th–9th segments distinctly longer than wide, 10th segment almost as long as wide, last segment distinctly longer than wide, obliquely truncated.

Pronotum almost parallel-sided, 1.22–1.31 mm long, 0.90–0.98 mm wide, slightly wider than head (PW:HW = 1.00–1.09); 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, 1.47–1.63 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, sparsely and finely punctate and pubescent.

Abdomen slightly narrowed posteriad, widest 1.39–1.47 mm, densely and finely punctate, punctures separated by 1–2 times their 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, partly filled by semimembranous 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. batangensis sp. n., but apical portion of median lobe distinctly wide ( Figs. 1 E, H); in lateral view, median lobe with a small tooth at the median portion ( Fig. 1 F); branches of paramere narrowly separated from each other and apical portion slightly curving.

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 yaanensis sp. n. is closely related to G. b a t a n g e n s i s sp. n. and G. zhaoi sp. n.. It can be easily distinguished from G. zhaoi sp. n. by the almost symmetrical apical portion of the median lobe of the aedeagus. Gabrius yaanensis sp. n. differs from G. batangensis sp. n. by distinctly wider apical portion of median lobe and different morphology of paramere.

Distribution. The species is at present known only from China (Sichuan).

Etymology. The specific name refers to the name of the type locality, Yaan.

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.