Quedius (Distichalius) wolong ZHENG, WANG &LIU, 2008

Smetana, Aleš, 2015, Contributions to the knowledge of the Quediina (Coleoptera, Staphylinidae, Staphylinini) of China. Part 51. Genus Quedius STEPHENS, 1829. Subgenus Distichalius CASEY, 1915. Section 4, Linzer biologische Beiträge 47 (1), pp. 905-924 : 914-915

Quedius (Distichalius) wolong ZHENG, WANG &LIU, 2008 ( Figs 37-42 )

wolong ZHENG, WANG & LIU, 2008: 670 ( Quedius ; subgenus Distichalius ; description; habitat)

N e w r e c o r d. CHINA: Sichuan: Mt. Emei, 17-VII-2003, Li Zhenli leg., 13 (SNUC).

R e d e s c r i p t i o n: Head black, pronotum piceous- black, both with metallic sheen, scutellum coppery, elytra brownish with coppery sheen; abdominal tergites dark brown, each becoming paler toward apical margin; tergite 2 (in front of first entirely visible tergite) dark brown; maxillary and labial palpi brown, antennae piceous, becoming black toward apex; legs pale testaceous, with all tibiae markedly blackened. Head of rounded shape, slightly wider than long (ratio 1.20), distinctly narrowed behind eyes, posterior angles entirely obsolete; eyes very large, convex, tempora considerably shorter than eyes seen from above (ratio 0.15); two setiferous punctures between anterior frontal punctures; posterior frontal puncture touching posteriomedial margin of eye; temporal puncture fine, touching posterior margin of eye; two punctures behind posterior frontal puncture at posterior margin of head; surface of head with extremely fine and dense microsculpture of transverse waves. Antenna rather short, segment 3 about as long as segment 2, segments 4 and 5 slightly longer than wide, following segments becoming gradually shorter, outer segments 9 and 10 about as long as wide, last segment slightly shorter than two preceding segments combined. Pronotum about as long as wide, widest at posterior third, markedly narrowed anteriad, with lateral margins continuously arcuate with broadly rounded base, transversely convex; dorsal rows each with three punctures, no additional punctures between dorsal and sublateral rows, sublateral rows each with two punctures, posterior puncture situated way behind large lateral puncture, one additional puncture anteriomedian of large lateral puncture; microsculpture on pronotum similar to that on head, but even finer and more superficial. Scutellum impunctate, with very dense and fine microsculpture of transverse waves. Elytra moderately long, at base somewhat narrower than pronotum at widest point, slightly widened posteriad; at suture vaguely (ratio 1.10), at sides distinctly (ratio 1.23) longer than pronotum at midline; punctation fine and dense, slightly asperate, evenly spaced, transverse interspaces between punctures about as large as diameters of punctures; surface between punctures without microsculpture; pubescence yellowish-golden. Wings apparently fully developed. Abdomen with tergite 7 (fifth visible) bearing distinct whitish apical seam of palisade fringe; tergite two (in front of first entirely visible tergite) impunctate; punctuation of abdominal tergites markedly finer than that on elytra, moderately dense, becoming somewhat sparser toward apex of each tergite and in general toward apex of abdomen; pubescence yellowis-golden; surface between punctures with exceedingly fine and dense transverse striae.

Male. First four segments of front tarsus markedly dilated, each densely covered by tenent setae ventrally; segment two vaguely wider than apex of tibia (ratio 1.10). Sternite 7 vaguely, widely sinuate apically; sternite 8 densely setose, with two long setae on each side, with wide and deep obtusely triangular medioapical emargination, small triangular area before emargination flattened and smooth ( Fig. 37 ). Genital segment with tergite 10 rather narrow, markedly narrowed toward narrowly arcuate apex, setose as in Fig. 38 ; sternite 9 sparingly setose, with long basal portion of characteristic shape, apical portion narrowly arcuate apically, with two differentiated setae ( Fig. 39 ). Aedoeagus ( Figs 40- 42 ) elongate, markedly asymmetrical; median lobe anteriorly broadly widened before markedly narrowed into narrow elongate apical portion apex of which is hook-like curved toward paramere; paramere large and long, with asymmetrical apical portion covering almost entirely apical half of median lobe except for very apex; four fine setae at apex, medial pair longer than lateral pair, two finer setae at each lateral margin below apex; underside of paramere with very numerous sensory peg setae situated along apical margin and extended as a long, irregular row along each lateral margin ( Fig. 42 ).

Female. Not available for study.

Length 5-6 mm (by ZHENG, WANG & LIU 2008). Studied male: 6.0 mm.

G e o g r a p h i c a l d i s t r i b u t i o n Quedius wolong is at present known from two localities in Sichuan: Wolong (original series) and Emei Shan.

B i o n o m i c s:Nothingisknown about the habitat preferences of this species.

R e c o g n i t i o n a n d c o m m e n t s: The species is easy to recognize in male sex thanks to the quite characteristic shape of the aedoeagus, but since the original description of some characters (particularly the chaetotaxy of the head and pronotum) is not quite accurate, the species is redescribed here to allow proper alignment with the related species.

Figures

Figs 31-44: 31-36: Quedius iaculifer sp. nov.: (31) tergite 10 of male genital segment; (32) aedoeagus, ventral view; (33) apical portion of median lobe, paramere removed; (34, 35) apical portion of underside of paramere with sensory peg setae; (36) tergite 10 of female genital segment. 37-42: Quedius wolong: (37) apical portion of male sternite 8; (38) tergite 10 of male genital segment; (39) sternite 9 of male genital segment; (40) aedoeagus, ventral view; (41) apical portion of median lobe, aedoeagus removed; (42) apical portion of underside of paramere with sensory peg setae. Quedius regularis: (43) tergite 10 of female genital segment. Quedius stouraci: (44) tergite 10 of female genital segment.