Triomicrus acutus Shen and Yin

Shen, Jia-Wei, Yin, Zi-Wei & Li, Li-Zhen, 2015, Six new species of Triomicrus Sharp from southern China (Coleoptera: Staphylinidae: Pselaphinae), Zootaxa 4044 (4), pp. 585-595 : 586-587

Triomicrus acutus Shen and Yin , new species

( Fig. 1 )

Type material (1 ♂). Holotype: China: ♂, labeled ‘ China: Guangdong Province, Ruyuan Hsien (viiAEA), Nanling N. R. (*≷), Hamashi (AE), 24°55’37’’N, 112°59’21’’E, mixed forest, leaf litter, sifted, 1750 m, 01.v.2015, Peng, Tu, Zhou leg.’

Diagnosis. Antennomere XI with moderately prominent disc-like protuberance at base. Head lacking median vertexal carina. Pronotum entirely, densely and coarsely punctate. Elytral subhumeral sulci absent. Profemora simple, protrochanters and protibiae lacking protuberance, mesotibiae with apical spur. Apical lamina of abdominal sternite VII transverse. Aedeagus with right parameres curved laterally, internal sac bearing several sclerotized spines and densely hairy sclerite.

Description. Male ( Fig. 1 A). Length 1.96 mm. Head slightly longer than wide, HL 0.45 mm, HW 0.38 mm, lacking median vertexal carina; lateral portions of frons coarsely punctate; each eye composed of about 29 facets. Antennomere XI ( Fig. 1 B, 1C) with moderately prominent disc-like protuberance at base, diameter of protuberance about one-seventh of segmental length. Pronotum wider than long, PL 0.43 mm, PW 0.48 mm, entirely covered with dense and coarse punctation. Profemora simple, protrochanters and protibiae lacking spur, mesotibiae with long acute apical spur ( Fig. 1 D). Elytra wider than long, EL 0.73 mm, EW 0.80 mm, smooth; subhumeral sulci absent. Abdomen wider than long, AL 0.35 mm, AW 0.71 mm; abdominal tergite IV (first visible tergite) with discal carinae extending to three-fifths of tergal length; abdominal sternite VII modified ( Fig. 1 E), with apical lamina transverse, rounded at apex of lateral margin. Length of aedeagus ( Fig. 1 F) including parameres 0.27 mm, right paramere curved laterally, internal sac bearing several sclerotized spines and densely hairy sclerite.

Female. Unknown.

Distribution. Southern China: Guangdong.

Etymology. The specific epithet ‘ acutus ’ in Latin means ‘pointed, sharp’, referring to the shape of the acute apical spur of the mesotibiae.

Figures

FIGURE 1. Diagnostic characters of Triomicrus acutus, male. A. Habitus. B. Antennal club, in dorsal view. C. Same, in lateral view. D. Mesotibia in dorsal view. E. Abdominal sternites VII – VIII. F. Aedeagus, in dorsal view. Scale bars: A = 0.5 mm; B, C = 0.2 mm; D – F = 0.1 mm.