Ocypus (Pseudocypus) pileaticulminis, He & Zhou, 2017

He, Liang & Zhou, Hong-Zhang, 2017, Taxonomy of the subgenus Pseudocypus Mulsant & Rey (Coleoptera: Staphylinidae: Staphylinini) and eight new species from China, Zootaxa 4339 (1), pp. 1-77 : 9-12

1. Ocypus (Pseudocypus) pileaticulminis sp. nov.

( Figs. 1-1, 1-2 )

Type locality: CHINA, Sichuan Province, South of Danba County, Wujiapengcun.

Type material. Holotype male, CHINA: Sichuan Province, South of Danba County, Wujiapengcun , 2630 m, 19–21. VII. 2001, coll. Xiaodong Yu and Hongzhang Zhou (IZ-CAS) . Paratypes: CHINA: Sichuan Province: 1 male, 1 female, same data as holotype (IZ-CAS).

Measurements. Body length: 22.4–25.3 mm. CL: 0.70; EL: 3.48; ELS: 1.73; EW: 3.98; HL: 3.48; HW: 4.42; PO: 1.87; PL: 4.49; PW: 4.00.

Description. Large-sized species. Body robust, entirely black except elytra paler; maxillary and labial palpi brunneous, antennae dark brunneous, with apical segments vaguely paler; legs dark brownish piceous, with tibiae and protarsus covered with brunneous pubescence; pubescence of dorsal side of head and pronotum dark rufous, and that of elytra and abdominal tergites tends to be paler.

Head of rounded quadrangular shape, relatively large and wide, with rounded posterior angles, wider than long (ratio 1.16), slightly narrowed toward basal parts. Eyes small and slightly protruding, considerably shorter than tempora (ratio 0.20) in dorsal view. Punctation and pubescence on dorsal surface of head moderately dense, puncture intervals larger than diameters of punctures; no impunctate midline present. Gular sutures subcontiguous in middle section. Antenna relatively short, segment 3 longer than segment 2 (ratio 1.42), segments 4 to 7 longer than wide, becoming shorter gradually, segments 8–10 about as long as wide, segment 11 longer and slightly wider than segment 10. Pronotum vaguely longer than wide (ratio 1.07), with posterior half slightly wider; narrow marginal groove disappearing downwards at anterior third of pronotal length; impunctate midline distinctly present; punctation and pubescence on disc about same as that on dorsal surface of head. Pronotal hypomeron asetose. Scutellum finely punctate and setose on entire surface. Elytra short, distinctly depressed at base, vaguely dilated posteriad; elytral length shorter than pronotum along midline, with a ratio of 0.61 along suture and a ratio of 0.86 along sides; punctation finer and denser than that on disk of head, combined with very dense microsculpture. Wings markedly reduced to small stumps. Abdominal tergite 2 densely and finely punctate and pubescent; all visible abdominal tergites finely and densely punctate, punctation becoming slightly sparser and coarser toward apex of abdomen; no yellowish tomentose pubescence present on visible tergites 4 and 5.

Male. Sternite 8 with sharply triangular medioapical emargination wide and deep ( Fig. 1-2 J ). Sternite 9 with apical emargination moderately deep, tapered basal portion moderately long ( Fig. 1-2 H ). Tergite 10 evenly narrowed toward apex, with apical portion broadly truncate, sparsely setose ( Fig. 1-2 A ). Aedeagus long, with apex of median lobe twisted and hat-like ( Figs. 1-1 C, 1-2 C, F ); leaf-shaped paramere markedly asymmetrical almost reaching apex of median lobe ( Figs. 1-1 B, C, 1-2 B-D); sensory peg setae on underside of paramere arranged along apical edge of paramere, not numerous ( Figs. 1-1 D, 1-2 G ).

Female. Second gonocoxite moderately long, bearing a single large seta near apical portion, shaped as in Figs. 1-1 E, 1- 2 I . Apical portion of tergite 10 markedly widened into duckbill shape, strongly sclerotized ( Fig. 1-2 E ).

Distribution. Ocypus pileaticulminis sp. nov. is at present known only from Danba County in western Sichuan Province.

Notes. Ocypus pileaticulminis sp. nov. can be distinguished from congeners by the shape of the aedeagus of the male and by the shape of abdominal tergite 10 of the female.

Etymology. The specific epithet, pileaticulminis , is from the Latin words " pileatus "(with hat or hat like) and " culmen " (culminis, tip, top), to indicate the special form of median lobe apex.

Figures

FIGURE 1 - 1. Ocypus (Pseudocypus) pileaticulminis sp. nov.: A. habitus of species (2.0 mm); B. aedeagus, lateral view; (0.5 mm); C. aedeagus, ventral view (0.5 mm); D. underside of apical portion of paramere (0.5 mm); E. second gonocoxite of female genital segment (0.5 mm). Scale in parentheses.

FIGURE 1 - 2. Ocypus (Pseudocypus) pileaticulminis sp. nov.: A. male tergite 10; B and D. aedeagus, lateral view; C. aedeagus, ventral view; E. female tergite 10; F. apical portion of median lobe, ventral view, paramere removed; G. underside of apical portion of paramere; H. male sternite 9; I. second gonocoxite of female genital segment; J. male sternite 8. Scale bars = 0.50 mm.