Gabrius curvus, 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 : 7-9

4. Gabrius curvus sp. n.

( Figs. 3 A–E)

Type material. Holotype: CHINA: Sichuan: ɗ, Daxue Shan, Gongga Shan Mt., Hailuogou Glacier Park, Way from Camp II to Camp I, 1940–2620 m, 31.V.1997, leg. A. Pütz (CPE). Paratype: CHINA: Sichuan: Ψ, same data as holotype, but 2650 m, 30.V.1997 ( NMW).

Description. Head and pronotum black, shining. Elytra black. Abdomen black with blue reflex. Antennae black with basal three segments dark brown. Mandibles, maxillary and labial palpi reddish-brown. Legs reddish-brown.

Body 6.61–6.94 mm long (HPL = 2.12–2.20 mm). Head of rounded quadrangular shape, 0.90 mm long, 0.73 mm wide (HW:HL = 0.82). Tempora 0.41 mm long, almost evenly rounded, sparsely and coarsely punctate; eyes moderately small, 0.25–0.33 mm long, 0.60–0.80 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 transverse waves. Antennae moderately long, 1st segment long, slightly thickened towards apex, 3rd segment distinctly longer than 2nd, 4th–6th segments distinctly longer than wide, 7th segment almost as long as wide, 8th–10th segments slightly transverse, last segment distinctly longer than wide, obliquely truncated.

Pronotum almost parallel-sided, 0.98 mm long, 0.82–0.90 mm wide, slightly wider than head (PW:HW = 1.10); dorsal rows each with six punctures, sublateral rows each with two punctures; entire surface with microsculpture similar to that on head.

Elytra 1.31 mm long, 1.31 mm wide, along sides 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 1.14 –1.22 mm, almost uniformly and densely punctate, punctures separated by 1–2 times their diameter; surface between punctures with exceedingly fine and dense microsculpture of transverse striae; tergites III–V with two basal lines, elevated area between basal lines almost impunctate.

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

Aedeagus distinctly asymmetrical; apical portion of median lobe bent to right in ventral view ( Figs. 3 A, C); in lateral view, apical portion slightly dilated, distinctly bent dorsad ( Figs. 3 B, D); paramere with rather unequal branches, face adjacent to median lobe with sensory peg setae closely arranged along apical margin of each branch ( Fig. 3 E).

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, with narrow, subacuate apex.

Remarks. The new species belongs to the G. deceptor group and is very similar to G. smetanai Schillhammer, 1997 . Gabrius curvus sp. n. differs from G. smetanai by legs reddish-brown (legs darker in the latter species) and distinctly curved apical portion of median lobe of aedeagus. Gabrius curvus sp. n. is also similar to G. leigongshanus sp. n. and G. nasiformis sp. n., but differs by black elytra and antennae and completely different apical portion of the aedeagus (elytra dark brown with posterior margins markedly reddish-brown in G. leigongshanus sp. n. and antennae entirely reddish-brown in G. nasiformis sp. n.).

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

Etymology. The specific epithet is derived from the Latin word curv- (curved), and refers to the curved subapical portion of the aedeagus.

Figures

FIGURE 3. Gabrius curvus sp. n. A, aedeagus, ventral view; B, median lobe of aedeagus (paramere removed), lateral view; C, apical portion of median lobe, ventral view; D, apical portion of median lobe, lateral view; E, underside of paramere. Gabrius leigongshanus sp. n. F, aedeagus, ventral view; G, median lobe of aedeagus (paramere removed), lateral view; H, apical portion of median lobe, ventral view; I, apical portion of median lobe, lateral view; J, underside of paramere. Gabrius nasiformis sp. n. K, aedeagus, ventral view; L, median lobe of aedeagus (paramere removed), lateral view; M, apical portion of median lobe, ventral view; N, apical portion of median lobe, lateral view; O, underside of paramere. Scale bars 0.5 mm.