Gabrius nasiformis, 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

11. Gabrius nasiformis sp. n.

( Figs. 3 K–O, 5I –K)

Type material. Holotype: CHINA: Sichuan: ɗ, Emeishan, 28.VIII.2005, leg. Zhang Yejun (IZ-CAS).

Description. Head and pronotum black, shining. Elytra dark brown. Abdomen black with blue reflex. Antennae entirely reddish-brown. Mandibles, maxillary and labial palpi and legs reddish-brown.

Body 5.96 mm long (HPL = 2.04 mm). Head of rounded quadrangular shape, 0.82 mm long, 0.74 mm wide (HW:HL = 0.90). Tempora 0.49 mm long, almost evenly rounded, sparsely and coarsely punctate; eyes small, 0.25 mm long, half 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, 1.06 mm long, 0.82 mm wide, slightly wider than head (PW:HW = 1.10); left dorsal row with six punctures, right dorsal row with eight punctures, sublateral rows each with two punctures; entire surface with microsculpture similar to that on head.

Elytra 1.22 mm long, 1.39 mm wide, along sides 1.15 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 1.31 mm, 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 with irregular a row of sparse punctures.

Male. Sternite VIII with wide, shallow medio-apical emargination ( Fig. 5 I). Genital segment with styli of tergite IX simple, moderately setose apically. Sternite IX with membranous middle portion, basal portion narrow and long, almost symmetrical, apical portion split apically into two pubescent lobes bearing apical setae ( Fig. 5 J). Tergite X simple, triangular, with widely emarginate at apex ( Fig. 5 K).

Aedeagus large; apical portion of median lobe asymmetrical, distinctly bent to right, with unconspicuous latero-subapical extension and narrowed into finger-like apex ( Figs. 3 K, M); in lateral view, apical portion gradually dilated, slightly bent dorsad, almost subrounded at apex ( Figs. 3 L, N); paramere short, divided into two wide branches, face adjacent to median lobe with sensory peg setae closely arranged along subapical margin of each branch ( Fig. 3 O).

Female. Unknown.

Remarks. Gabrius nasiformis sp. n. also belongs to G. deceptor group. It is very similar to G. leigongshanus sp. n.. It differs from G. leigongshanus sp. n. by the lighter antennae and the differently shaped apical portion of the median lobe of the aedeagus.

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

Etymology. The specific epithet is a combination of the Latin words nasus- (nose) and forma- (shape), and refers to the shape of median lobe of aedeagus (like the nose of elephant).

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.

FIGURE 5. Gabrius disparatus sp. n. A, aedeagus, ventral view; B, median lobe of aedeagus (paramere removed), lateral view; C, underside of paramere; D, tergite X of male; H, sternite VIII of male. Gabrius extraneus sp. n. E, underside of paramere; F, aedeagus, ventral view; G, median lobe of aedeagus (paramere removed), lateral view. Gabrius nasiformis sp. n. I, sternite VIII of male; J, sternite IX of male; K, tergite X of male. Scale bars 0.5 mm.