Quedius (Raphirus) pengi, Ma & Hu, 2021

Ma, Wen-Jing & Hu, Jia-Yao, 2021, A new species of Quedius Stephens in Zhejiang, China (Coleoptera, Staphylinidae, Staphylinini), Zootaxa 4985 (3), pp. 447-450 : 447-449

Quedius (Raphirus) pengi sp. n. ( Figs 1–13 )

Type material. Holotype: male, China: S. Zhejiang, Longquan, Fengyang Shan, creek valley nr. hotel , 27°54’42”N, 119°11’52”E, leaf litter, wood, sifted, beating, 1190–1250m, 28.IV.2014, Peng, Song, Yan, Yin & Yu leg. ( SNUC).

Description. Body length: 7.6 mm; forebody length: 3.3 mm.

Body ( Fig. 1 ) shiny, head, pronotum and elytra dark metallic blue, abdomen black and iridescent; maxillary and labial palpi brown; antennae brown, first segments and apical halves of following two segments black; legs black with femora and front coxae yellowish.

Head ( Figs 2, 3 ) slightly wider than long (ratio 1.14); eyes large and convex, tempora distinctly shorter than eyes seen from above (ratio 0.17); dorsal surface of head with coarse and dense punctation; clypeus and vertex lacking punctures; surface with fine and dense microsculpture of transverse waves, becoming almost meshed anterior to vertex ( Fig. 4 ). Antennae slightly widened toward apex, segments III slightly longer than II, segments IV–IX longer than wide, gradually becoming shorter, segments X about as long as wide, last segments about as long as two preceding segments combined.

Pronotum ( Figs 2, 3 ) about as long as wide; lateral portions not explanate; dorsal rows irregular, each with six coarse punctures; sublateral rows each expanded into irregular group of ten coarse punctures; with many dense and fine punctures bearing whitish hairs in wide strip along front half of lateral margin; surface with fine and dense microsculpture of transverse waves ( Fig. 5 ). Scutellum with fine microsculpture of transverse waves ( Fig. 6 ). Elytra at base about as wide as pronotum at widest point, at suture slightly shorter (ratio 0.81), at lateral margins slightly longer (ratio 1.25) than pronotum at midline; punctation coarse and dense, on disc forming transverse rugae; pubescence dark, intermixed with whitish hairs, particularly on lateral portion of each elytron; surface without microsculpture. Wings fully developed.

Abdomen ( Fig. 1 ) with tergite VII bearing distinct whitish apical seam of palisade fringe; punctation moderately fine and dense; pubescence black at middle portion, with some whitish hairs at both lateral portions and at apical margin of each tergite; surface with fine and dense microsculpture of transverse waves ( Fig. 7 ).

Male. First four segments of front tarsus distinctly dilated. Sternite VIII ( Fig. 8 ) with two long setae each side, with wide, triangular medioapical emargination. Sternite IX ( Fig. 9 ) simply rounded in medioapical emargination, without differentiated setae. Tergite X ( Fig. 10 ) with five long setae near posterior margin and some shorter setae anterior to them. Aedeagus ( Figs 11–13 ) with median lobe gradually narrowed into cone-shaped apex; paramere extending slightly beyond apex of median lobe; with two setae at apex, two slightly shorter setae and one distinctly longer setae at each lateral margin below apex; underside of paramere with sensory peg setae forming two irregular longitudinal rows, each with thirteen or fifteen peg setae.

Female. Unknown.

Distribution. Known only from the type locality: Fengyang Shan in southern Zhejiang.

Remarks. The new species is similar to Q. torrentum Smetana, 2002 in appearance, but can be separated by the punctation of the head and pronotum slightly coarser, without fine punctures between the coarse setiferous punctures; by the dorsal rows each with only six punctures; and by the apical portion of paramere slightly wider, sensory peg setae forming two irregular longitudinal rows. The new species can be easily separated from Q. cupreonotus and Q. cupreostigma of intricatus -group, both from Zhejiang, by its elytra without coppery spots on medioapical corner, and by the quite different form of the sensory peg setae on paramere of aedeagus.

Etymology. The species is named in honor of Peng Zhong, one of the collectors of the type specimen.

Figures

FIGURES 1–3. Q. pengi 1. habitus; 2. forebody in dorsal view; 3. forebody in lateral view. Scale bars: 1 mm.

FIGURES 4–13. Q. pengi 4. dorsal surface of head; 5. dorsal surface of pronotum; 6. scutellum; 7. abdominal tergite V; 8. male sternite VIII; 9. male sternite IX; 10. male tergite X; 11. aedeagus in ventral view; 12. aedeagus in lateral view; 13. apical portion of underside of paramere. Scale bars: 4–7 = 0.1 mm, 8–13 = 0.2 mm.