Triomicrus pinnatus 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 : 592-593

Triomicrus pinnatus Shen and Yin , new species

( Fig. 6 )

Type material (3 ♂♂, 1 ♀). Holotype: China: ♂, labeled ‘ China: Guangdong Province, Ruyuan Hsien (viiAEA), Nanling N. R. (*≷), Laopengkeng (+*W), 24°56’29’’N, 113°00’27’’E, mixed forest, leaf litter, wood, sifted, 1360 m, 29.iv.2015, Peng, Tu, Zhou leg.’ ( SNUC). Paratypes: China: 1 ♂, 1 ♀, same data as the holotype ( SNUC); 1 ♂, labeled ‘ China: Hunan, Chenzhou, Yizhang Hsien (ZAA), Mangshan N. R. (WM), 24°56’26’’N, 112°59’18’’E, mixed forest, leaf litter, wood, sifted & beating, 1400 m, 26.iv.2015, Peng, Tu, Zhou leg.’ ( SNUC).

Diagnosis. Antennomere XI with impression surrounding slightly prominent, disc-like protuberance near base. Head lacking median vertexal carina. Pronotum entirely, densely and coarsely punctate. Elytral subhumeral sulci absent. Profemora simple, protrochanters and protibiae lacking protuberance, mesotibiae lacking spur. Apical lamina of abdominal sternite VII widest near base. Aedeagus with right paramere curved mesally, internal sac bearing several sclerotized spines, lacking hairy sclerite.

Description. Male ( Fig. 6 A). Length 1.95–2.05 mm. Head longer than wide, HL 0.43–0.45 mm, HW 0.43– 0.44 mm, lacking median vertexal carina; lateral portions of frons densely and coarsely punctate; each eye composed of about 30 facets. Antennomere XI ( Fig. 6 B, 6C) with impression near base around slightly prominent, disc-like protuberance, diameter of impression slightly more than two-fifths of segmental length. Pronotum wider than long, PL 0.41–0.44 mm, PW 0.50–0.53 mm, entirely covered with dense and coarse punctation. Profemora simple, protrochanters and protibiae lacking protuberance, mesotibiae lacking spur. Elytra wider than long, EL 0.73–0.75 mm, EW 0.80–0.83 mm, relatively smooth; subhumeral sulci absent. Abdomen wider than long, AL 0.38–0.43 mm, AW 0.73–0.74 mm; abdominal tergite IV (first visible tergite) with discal carinae extending to fourfifths of tergal length; abdominal sternite VII modified ( Fig. 6 D), with apical lamina widest near base, posterior margin obliquely narrowed, pointed at apex. Length of aedeagus ( Fig. 6 E) 0.32 mm, with right paramere curved mesally, internal sac bearing several sclerotized spines, lacking hairy sclerite.

Female. Similar to male; antennomere XI unmodified. Each eye composed of about 17 facets. Measurements: BL 1.88 mm, HL 0.43 mm, HW 0.41 mm, PL 0.41 mm, PW 0.48 mm, EL 0.71 mm, EW 0.80 mm, AL 0.35 mm, AW 0.73 mm.

Distribution. Southern China: Guangdong, southern Hunan.

Etymology. The specific epithet ‘ pinnatus ’ in Latin means ‘having wings, winged’, referring to the characteristic apical lamina of sternite VII.

Figures

FIGURE 6. Diagnostic characters of Triomicrus pinnatus, male. A. Habitus. B. Antennal club, in dorsal view. C. Same, in lateral view. D. Abdominal sternites VII – VIII. E. Aedeagus, in dorsal view. Scale bars: A = 0.5 mm; B, C = 0.2 mm; D, E = 0.1 mm.