Cyanocypus leukos, He & Zhou, 2020

He, Liang & Zhou, Hong-Zhang, 2020, Cyanocypus gen. nov., a new rove beetle genus of the “ Staphylinus-complex ” (Coleoptera: Staphylinidae) with one new species from China, Zootaxa 4759 (2), pp. 261-268 : 264-267

Cyanocypus leukos sp. nov.

( Figs. 1 , 3 , 4 )

Type material. Holotype male, CHINA: Yunnan Province: Tengchong, Jietou Datang, Dahelingganjiao ,

25.7393°N, 98.69633°E, 2010 m, 2006.5.20 day, Liang H. B., Hu P. California Academy & IOZ, Chinese Acad. Sci. (IZ-CAS); Paratype, 1 male, CHINA: Yunnan Province: Gongshan, Shuanglahe, on road to Bingzhongluo , N27°58’59’’, E98°39’15’’, 1588 m, 2002.4.17, day, Liang H. B., Ba Weidong, IOZ and KIB Expedition Institute Zoology, CAS (IZ-CAS) .

Measurements. Holotype: Body length: 15.0 mm. CL: 0.80; EL: 3.80; ELS: 2.28; EW: 3.93; HL: 2.30; HW: 2.72; PO: 0.98; PL: 3.34; PW: 2.77. Paratype: Body length: 13.7 mm. CL: 0.68; EL: 2.98; ELS: 1.65; EW: 2.86; HL: 1.97; HW: 2.24; PO: 0.76; PL: 2.59; PW: 2.14.

Description. Medium sized species, not robust. Head, pronotum and elytra with shining blue metallic luster; abdomen black; maxillary and labial palpi dark brown to brownish-piceous, with apex of each segment usually paler, tending to be brown or even yellow; antenna black; legs black to reddish-brown. Elytra each with some white tomentose pubescence along apical and basal margins as well as along suture, and with spots of pale white tomentose pubescence at about middle of each elytron; abdomen with first two visible abdominal tergites each with conspicuous patches of white tomentose pubescence along apical and lateral margins; visible abdominal tergite 3 with patch of white tomentose pubescence in each anteriolateral corner, and with dark brown tomentose pubescence covering posterior half; visible abdominal tergite 4 with dark brown tomentose pubescence covering almost entire tergite, only in each anteriolateral corner decorated with some inconspicuous white tomentose pubescence; visible abdominal tergite 5 almost totally covered with white tomentose pubescence, with only posterior forth covered with dark brown tomentose pubescence; pubescence of legs, particularly that of all tibiae and tarsi white or yellowish white.

Head of rounded quadrangular shape, with obtusely rounded posterior angles, wider than long (ratio: holotype 1.18, paratype 1.14); eyes moderately large and slightly protruding, vaguely shorter than tempora (ratio: holotype 0.82, paratype 0.89) in dorsal view; punctation and pubescence on dorsal surface of head dense and extremely robust, punctation gradually becoming sparser toward clypeus; interspaces between punctures shiny, without microsculpture, distinctly larger than diameters of punctures; Y-shaped epicranial line clearly present on head disc. Antenna moderately long, relatively slender, segment 3 slightly longer than segment 2, segment 4 to 8 distinctly longer than wide, gradually becoming wider and shorter toward apex, segment 9 and 10 about as long as wide, last segment short, with nearly obliquely truncate apex. Pronotum distinctly longer than wide (ratio: holotype 1.21, paratype 1.21), vaguely narrowed posteriad, with widely arcuate posterior margin; narrow marginal groove disappearing downwards at about posterior third of pronotal length; disc of pronotum with impunctate midline clearly present near basal portion, gradually disappearing toward middle portion of pronotal disc; punctation and pubescence on disc similar to that on head but finer, interspaces between punctures without microsculpture. Scutellum triangular, entirely finely and densely punctate, appearing quite dull. Elytra moderately long, at midline distinctly shorter (ratio: holotype 0.68, paratype 0.64), at sides vaguely longer (ratio: holotype 1.14, paratype 1.15) than pronotum at midline; punctation distinctly finer and denser than that on pronotum, interspaces shiny, but appearing slightly duller than those on head and pronotum. Wings fully developed. Abdomen moderately long, with almost parallel lateral sides, widest at about posterior margin of visible tergite 3.

Male. Abdominal sternite 8 with widely rounded medioapical emargination. Sternite 9 shaped as in Fig. 4 G , with tapered basal portion short and narrow; apical portion with obtusely triangular medioapical emargination. Tergite 10 almost triangular, with apical portion distinctly narrowed toward apex, shaped as in Fig. 4 E , sparsely setose. Aedeagus moderately long; median lobe with obliquely truncate apex in ventral view, shaped as in Fig. 4 F ; apical portion of paramere tongue-shaped, with inconspicuous medioapical emargination; numerous sensory peg setae arranged along lateral sides of underside, almost reaching basal part of apical portion of paramere, shaped as in Figs. 3 E , 4 A .

Female. Unknown.

Distribution. Cyanocypus leukos sp. nov. is known at present from west and northwest Yunnan Province.

Notes. The holotype and paratype were both taken from mountain areas in west and northwest Yunnan Province. Although the exact longitude and latitude are given by attached labels, details of collecting circumstances are not known.

Etymology. The specific epithet is from the Greek word leukos (bright, white), to indicate the white body hairs of the beetle.

Figures

FIGURE 1. Cyanocypus leukos He & Zhou, sp. nov.: A. habitus, dorsal view (2.0 mm); B. habitus, ventral view (2.0 mm); C. left mandible (0.5 mm); D. right mandible (0.5 mm). Scales in parentheses.

FIGURE 3. Cyanocypus leukos He & Zhou, sp. nov.: A. head, ventral view; B. head, dorsal view; C. aedeagus, lateral view; D. aedeagus, ventral view; E. underside of apical portion of paramere. Scale bars = 0.50 mm.

FIGURE 4. Cyanocypus leukos He & Zhou, sp. nov.: A. underside of apical portion of paramere; B and D. aedeagus, lateral view; C. aedeagus, ventral view; E. male tergite 10; F. apical portion of median lobe, ventral view, paramere removed; G. male sternite 9; H. male sternite 8. Scale bars = 0.50 mm.