Quwatanabius yanbini, Hu, Jiayao, Li, Lizhen & Zhao, Meijun, 2012

Hu, Jiayao, Li, Lizhen & Zhao, Meijun, 2012, Quwatanabius Smetana — a new genus in the fauna of the Mainland China (Coleoptera, Staphylinidae), with description of two new species, Zootaxa 3191, pp. 65-68 : 65-67

Quwatanabius yanbini sp. nov.

( Figs. 1–8 )

Type material. Holotype: male ( SNUC), China: Guangdong Prov., Shaoguan City, Nanling N. R., 17-VIII-2010, Lizhen LI leg. Paratypes: 2 females ( SNUC, ASC), same data as in holotype.

Description. BL 4.9–5.8 mm; FL 2.3–2.8 mm.

Body ( Fig. 1 ) dark brown; mouthparts and appendages brown; front margin of pronotum and apical margin of each abdominal tergite reddish brown.

Head slightly wider than long (HW/HL = 1.27); eyes small, slightly convex (TL/EyL = 1.10); no additional setiferous punctures between anterior frontal punctures; one additional setiferous puncture behind anterior frontal puncture at posterio-medial margin of eye; posterior frontal puncture situated almost midway between posterio-median margin of eye and posterior margin of head; two additional setiferous punctures between posterior frontal puncture and posterior margin of head; temporal puncture situated distinctly closer to posterior margin of head than to posterior margin of eye; surface of head without microsculpture. Antennae short; relative length of each antennomere from 1 to 11: 24.0: 17.0: 17.0: 10.0: 10.0: 10.0: 10.0: 10.0: 11.0: 12.0: 21.0; relative width of each antennomere from 1 to 11: 7.0: 8.0: 8.0: 9.0: 10.0: 11.0: 11.0: 12.0: 13.0: 13.0: 12.0.

Pronotum wider than long (PW/PL = 1.20); dorsal rows each with one puncture close to anterior margin; surface without microsculpture. Scutellum impunctate, with traces of fine microsculpture of transverse waves at base. Elytra vaguely wider (EW/PW = 1.09) than pronotum, at suture vaguely (ELs/PL = 1.05), at lateral margins slightly (ELm/PL = 1.19) longer than pronotum at midline; each elytron with two slightly irregular longitudinal rows formed by four punctures, with longer setae in punctures; surface without microsculpture. Wings fully developed.

Abdominal tergite 7 with whitish apical seam of palisade fringe; all tergites with fine and dense punctation, and dark brown pubescence; surface between punctures with fine and dense microsculpture of transverse waves.

Male. Basal four tarsomeres markedly dilated, sub-bilobed, each with tenent setate ventrally; Sternite 8 ( Fig. 2 ) with two long, thick lateral setae; with wide, obtusely triangular medio-apical emargination; sternite 9 ( Fig. 3 ) slightly emarginate medio-apically, with single long seta at each side of emargination; tergite 10 ( Fig. 4 ) distinctly emarginate medio-apically, with one or two thick setae at each side of emargination and with one additional long seta. Aedeagus ( Fig. 5, 6 ) with median lobe subparallel-sided in middle portion, then conically narrowed into acute apex. Paramere very small, reduced into a triangular thin sheet; lacking setae and sensory peg setae. Inner sac with large sclerites, as in Fig. 7 . Female. Basal four segments of front tarsus similar to those of male. Tergite 10 ( Fig. 8 ) gradually narrowed toward minutely emarginate apex, with seven long, strong setae at apical margin.

Remarks. The new species may be distinguished from the similar Qu. flavicornis ( Sharp, 1889) , in addition to the characters of the aedoeagus, by the dark brown elytra and by the male sternite 8 bearing triangular medio-apical emargination. In Qu. flavicornis basal 1/3 of elytra is reddish brown, male sternite 8 bears round medio-apical emargination, and shape of the aedoeagus is different.

Distribution. The new species is known only from the type locality in Southern China (Guangdong).

Etymology. The specific name is dedicated to our deceased colleague, Yan-bin Zhai, who died so young in an accident during the recent collecting trip to Guangxi.

Figures

FIGURES 1 – 8. Quwatanabius yanbini sp. nov. 1 — habitus; 2 — male sternite 8; 3 — male sternite 9; 4 — male tergite 10; 5 — aedeagus in ventral view; 6 — aedeagus in lateral view; 7 — inner sac of aedeagus in lateral view; 8 — female tergite 10. Scale bars: a = 1 mm, b = 0.5 mm, c = 0.25 mm.