Triomicrus tibialis Shen and Yin

Shen, Jia-Wei, Yin, Zi-Wei & Li, Li-Zhen, 2015, Triomicrus Sharp of Eastern China (Coleoptera: Staphylinidae: Pselaphinae), Zootaxa 4007 (4), pp. 509-528 : 524-525

Triomicrus tibialis Shen and Yin , new species

( Fig. 13 )

Type material (2 ♂♂). Holotype: China: ♂, labeled ‘ China: Zhejiang Prov, Hangzhou City, Wuchao Shan (午潮 山), mixed leaf litter, sifted, 200 m, 11.iv.2011, Peng & Zhu leg.’ ( SNUC). Paratypes: China: 1 ♂, same label data as the holotype, except ‘ 09.iv.2011, Peng & Zhu leg.’ ( SNUC).

Diagnosis. Antennomere XI with impression surrounding strongly prominent disc-like protuberance near base. Head lacking median vertexal carina. Pronotum finely and sparsely punctate. Elytral subhumeral sulci long, reaching level of metacoxae. Profemora simple, protrochanters and protibiae lacking spur or spine, mesotibiae with preapical projection. Abdominal sternite VII transverse, pointed at apex of lateral margin. Aedeagus with right paramere curved mesally, internal sac bearing many small sclerotized spines, lacking hairy sclerite.

Description. Male ( Fig. 13 A). Length 2.13–2.17 mm. Head longer than wide, HL 0.43–0.47 mm, HW 0.40– 0.42 mm, lacking median vertexal carina; lateral portions of frons finely and sparsely punctate; each eye composed of about 39 facets. Antennomere XI ( Fig. 13 B–C) with impression surrounding strongly prominent disc-like protuberance near base, diameter of impression about one-third of segmental length. Pronotum wider than long, PL 0.41–0.46 mm, PW 0.50–0.53 mm, with fine and sparse punctation. Profemora simple, protrochanters and protibiae lacking spur or spine, mesotibiae angularly projected mesally near apex ( Fig. 13 E). Elytra wider than long, EL 0.73–0.76 mm, EW 0.81–0.86 mm, finely punctate. Subhumeral sulci long, reaching level of metacoxae. Abdomen wider than long, AL 0.46–0.48 mm, AW 0.71–0.77 mm; abdominal tergite IV (first visible tergite) with discal carinae extending to two-fifths of tergal length; abdominal sternite VII modified ( Fig. 13 D), with apical lamina transverse, strongly curved mesally, pointed at apex. Length of aedeagus ( Fig. 13 F) including parameres 0.31 mm, with right paramere curved mesally, internal sac bearing numerous small sclerotized spines, lacking hairy sclerite.

Female. Unknown.

Distribution. Eastern China: Zhejiang.

Etymology. The specific epithet ‘ tibialis ’ refers to the triangular apical projection of the mesotibiae.

Figures

FIGURE 13. Diagnostic characters of Triomicrus tibialis, male. A. Habitus. B. Antennal club, in dorsal view. C. Same, in lateral view. D. Abdominal sternites VII – VIII. E. Mesotibia in dorsal view. F. Aedeagus, in dorsal view. Scale bars: A = 0.5 mm; B, C = 0.2 mm; D – F = 0.1 mm.