Ocypus, Zhou, 2017

Zhou, Hong-Zhang, 2017, Taxonomy of the subgenus Ocypus Leach (Coleoptera: Staphylinidae: Staphylinini) and three new species from China, Zootaxa 4312 (2), pp. 293-310 : 295-298

1. Ocypus (s. str.) liui sp. nov.

( Figs. 1-1, 1-2, 1-3 )

Type material. Holotype male, CHINA: Yunnan Province: Pingbian County, Dawei Mountain , 11.VI.2016, coll. Huan Yang (CBL). Paratype: CHINA: Yunnan Province: 1 female, same data as holotype (CBL).

Measurements. Body length: 24.2-24.8 mm. CL: 0.86; EL: 3.90; ELS: 2.16; EW: 5.07; HL: 4.25; HW: 4.53; PO: 2.42; PL: 5.02; PW: 4.49.

Description. Large-sized species. Body robust, entirely black; maxillary and labial palpi brunneous, antennae dark brunneous, with apical segments vaguely paler; legs black, with paler tibiae; protibiae and protarsi covered with dense brown pubescence; pubescence of dorsal side of head and pronotum black-rufous, and that of elytra and abdominal tergites are almost the same.

Head rounded, quadrangular, only slightly wider than long (ratio 1.07), relatively narrower than congeners; tempora extremely long, with rounded posterior angles and very slightly narrowed towards basal parts. Eyes relatively small and slightly protruding, distinctly shorter than tempora (ratio 0.36) in dorsal view. Punctation and pubescence on dorsal surface of head relatively dense and fine, puncture intervals as long as or smaller than diameters of punctures; punctation gradually becoming sparser toward clypeus; impunctate midline vague, almost invisible in male, slightly more distinct in female. Gular sutures subcontiguous. Antenna moderately long, segment 3 longer than segment 2 (ratio 1.41), all the segments except segment 10 considerably longer than wide with a ratio greater than 1.90, segment 10 also longer than wide with a ratio of 1.31. Pronotum vaguely longer than wide (ratio 1.12), slightly narrowed anteriad from anterior third; narrow marginal groove disappearing downwards at anterior fourth of pronotal length; impunctate midline distinct, especially in female; punctation and pubescence on disc about the same as that on dorsal surface of head. Pronotal hypomeron lacking microsetae. Scutellum finely punctate and setose on entire surface. Elytra short, vaguely dilated posteriad and moderately depressed at base; elytral length shorter than pronotum along midline, with a ratio of 0.43 along suture and a ratio of 0.78 along sides; elytral punctation much finer and denser than that on head disk, combined with very dense microsculpture. Wings reduced to nonfunctional stumps. Abdominal tergite 2 densely and finely punctate and pubescent; all visible abdominal tergites finely and densely punctate, punctation gradually becoming sparser and coarser toward apex of abdomen; no yellowish tomentose pubescence on visible tergites 4 and 5.

Male. Abdominal sternite 8 with triangular medioapical emargination moderately wide and obtuse ( Fig. 1-2 J). Sternite 9 with wide and obtuse apical emargination ( Fig. 1-2 H). Tergite 10 moderately wide, evenly narrowed toward arcuate apex, densely setose; apical portion strongly sclerotized ( Fig. 1-2 A). Aedeagus relatively short and simple, with wide finger-shaped apical portion ( Figs. 1-1 B, C, 1-2 B-D); apical portion of paramere markedly asymmetrical, with short carina on face towards median lobe; no sensory peg setae on underside of paramere ( Figs. 1-1 D, 1-2 G).

Female. Second gonocoxite moderately long, shaped as in Figs. 1-1 E, 1- 2 I. Tergite 10 of female relatively wide, with apical portion strongly sclerotized, slightly narrowed toward arcuate apex, densely setose ( Fig. 1-2 E).

Distribution. Ocypus (s. str.) liui sp. nov. is at present known only from the type locality.

Notes. Ocypus (s. str.) liui sp. nov. can easily be distinguished from other species by the ratio of length to width of head, and by the uniquely shaped aedeagus.

The mandibles of the two known specimens of Ocypus (s. str.) liui sp. nov. show some difference. The apex of mandibles of male specimen are sharp, both with a small notch in middle portion near teeth; while the apex of mandibles of the female one are quite dull, without notches in middle portion ( Figs. 1-3 ).

Etymology. The species is named in honor of Mr. Bin Liu, the owner of the specimens, for his generous help with this study.

Figures

FIGURE 1 - 1. Ocypus (s. str.) liui 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 (s. str.) liui 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).

FIGURE 1 - 3. Ocypus (s. str.) liui sp. nov.: A. head of male; B. head of female (Scale bars = 2.0 mm).