Ocychinus motuoensis, Zhao & Tang, 2020

Zhao, Xin & Tang, Liang, 2020, Three new species of the genus Ocychinus (Coleoptera, Staphylinidae) from China, Zootaxa 4789 (1), pp. 204-216 : 205

Ocychinus motuoensis sp. n.

(Figs. 1, 2, 21–26, 42, 44)

Type material. Holotype. China: Xizang: ♂, glued on a card with labels as follows: “ China : Xizang A. R., Motuo County, 62k, 29°42′33.73″N 95°35′32.28″E, alt. 2794m, 27.VII.2013, pitfall trap, Zhang & Li leg.” “ Holotype / Ocychinus motuoensis / Zhao & Tang” [red handwritten label] ( SHNU).

Description. Measurements of male: BL: 17.0 mm, FL: 9.1 mm. HL: 2.77 mm, HW: 3.07 mm, EYL: 0.61 mm, TL: 1.47 mm, PL: 3.37 mm, PW: 2.88 mm, EL: 2.79 mm, EW: 3.3 mm. HW/HL: 1.11, TL/EYL: 2.41, PL/PW: 1.17, EL/EW: 0.84.

Forebody with dorsal side metallic blue and ventral side brown to dark brown, abdomen brownish with dorsal side metallic blue and ventral side metallic purple, portions along posterior margin of segments III–VI fainter, the apical margin of segment VI, entire VIII and the genital segment yellowish; appendages reddish with first three antennomeres and coxae slightly darker.

Head 1.11 times as wide as long, rounded quadrangular, posterior angles obtusely rounded, tempora longer than eyes (ratio 2.41), dorsal surface of head with dual punctation, fine punctures intermixed with markedly coarser punctures, the punctation of median portion distinctly sparser than that of the lateral portions, interstices densely reticulated, those of median portion mostly wider than the diameter of coarse punctures, those of lateral portions varied from narrower than half diameter of the coarse punctures to about as wide as coarse punctures.

Pronotum 1.17 times as long as wide, widest at about basal half, impunctate midline very indistinct; punctation and interstices similar to those of head, though the punctation is more or less sparser.

Elytra 0.84 times as long as wide, shorter than pronotum (ratio 0.83).

Abdomen semi-cylindrical, posterior margin of tergite VII without palisade fringe; tergites III–VII with punctation dense and fine, interstices transversely microsculptured.

Male. Sternite VIII emarginated at middle of posterior margin; sternite IX ( Fig. 21 ) with deep apical emargination; tergite X ( Fig. 22 ) subtrapezoidal. Aedeagus ( Figs. 23, 24 ) with median lobe distinctly asymmetrical and sharply pointed at apex, paramere a little asymmetrical, a little longer than median lobe, underside of paramere ( Figs. 25, 26 ) with numerous sensory peg setae in apical portion.

Female. Unknown.

Distribution. China (Xizang).

Remarks. The species may be readily recognized from all other species (except O. smetanai sp. n.) by the metallic coloration and dense reticulation of the forebody. From O. smetanai sp. n. described in this paper, it can be distinguished by the larger body size (FL: 9.1 mm), the less rounded posterior angles of head ( Fig. 42 ), the larger ratio of TL/EYL (2.41), greater number of large punctures on pronotum ( Fig. 42 ), and the denser punctation of abdominal tergites ( Fig. 44 ).

Etymology. The specific name is derived from the type locality of this species.

Figures

FIGURES 21–26. Ocychinus mutuoensis. 21 male sternite IX; 22 male tergite X; 23, 24 aedeagus; 25, 26 apical portion of paramere. Scale bars = 0.2 mm.

FIGURES 42–45. Ocychinus. 42 head and pronotum of O. muotuoensis; 43 head and pronotum of O. smetanai; 44 abdominal tergite IV of O. muotuoensis; 45 abdominal tergite IV of O. smetanai. Scale bars = 2 mm.