Gabrius extraneus, 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 : 13-14

7. Gabrius extraneus sp. n.

( Fig. 5 E–G)

Type material. Holotype: CHINA: Beijing: ɗ, Xiaolongmen: Liyuanling, 1070 m, 13.V.2000, leg. Yu Xiaodong (IZ-CAS). Paratype: CHINA: Shanxi: ɗ, Li Shan, SE-slopes of Shunwangping (35°24’N, 111°58’E), 1800–2200 m, 4.VII.2006, leg. J. Turna ( NMW).

Description. Head and pronotum black, shining. Antennae reddish-brown. Elytra balck-brown. Abdomen black with feebly blue reflex, posterior margin of each tergite narrowly reddish-brown. Mandibles, maxillary and labial palpi and legs reddish-brown.

Body 6.53 mm long (HPL = 2.20 mm). Head of rounded quadrangular shape, 0.90 mm long, 0.65 mm wide (HW: HL = 0.73). Tempora 0.41 mm long, almost evenly rounded, sparsely and coarsely punctate; eyes small, slightly protruding, 0.25 mm long, 0.60 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 slightly longer than 2nd, 4th–5th segments longer than wide, 6th segment almost as long as wide, 7th–10th segments distinctly transverse, last segment slightly longer than wide, obliquely truncated.

Pronotum slightly narrowed anteriad, 1.22 mm long, 0.98 mm wide, distinctly wider than head (PW:HW = 1.50); dorsal rows each with five punctures, sublateral rows each with two punctures; entire surface with microsculpture similar to that on head.

Elytra 1.55 mm long, 1.39 mm wide, along sides 1.27 times as long as pronotum, sparsely and finely punctate, punctures separated by 4–5 times their diameter. Scutellum large, triangular, sparsely and finely punctate and pubescent.

Abdomen slightly narrowed posteriad, widest 1.31 mm, uniformly and densely punctate, punctures separated by 2–3 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 shallow, almost acutangular medio-apical emargination filled by extensive semimembranous extension and dense row of long and stiff setae along apical margin; tergite VIII with very narrow medio-apical notch, notch bordered by two short and acute processes.

Aedeagus moderately large; median lobe long, distinctly exceeding paramere, apical portion slender, characteristically shaped ( Fig. 5 F); in lateral view, apical portion distinctly bent dorsad, subtruncated at apex ( Fig. 5 G); paramere entire, with triangular apical portion, face adjacent to median lobe with sensory peg setae closely arranged along apical margin of paramere ( Fig. 5 E).

Female. Unknown.

Remarks. The species belongs to the Gabrius osseticus group. Externally, it is most similar to G. insignis ( Luze, 1904) and G. mandschuricus ( Bernhauer, 1914) . It differs from G. insignis by the more robust pronotum with distinct microsculpture (indistinct and partly obsolete in G. insignis ) and from G. mandschuricus by the impunctate elevated area between two basal lines on first three visible tergites. It differs from both by the completely different aedeagus.

Distribution. The species at present known only from Eastern China (Beijing, Shanxi).

Etymology. The specific epithet is derived from the Latin word extrane- (strange), and refers to the strange shape of the aedeagus.

Figures

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.