Triomicrus inaequalis 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 : 521-522

Triomicrus inaequalis Shen and Yin , new species

( Fig. 11 )

Type material (1 ♂, 2 ♀♀). Holotype: China: ♂, labeled ‘ China: Anhui, Anqing City, Qianshan country (潜山县), Tianzhu Shan (天柱山), mixed leaf litter, sifted, alt. 960 m, 23.iv.2005, Hu & Tang leg.’ ( SNUC). Paratypes: China: 2 ♀♀, same data as holotype ( SNUC).

Diagnosis. Antennomere XI with impression surrounding moderately prominent disc-like protuberance near base. Head lacking median vertexal carina. Pronotum relatively smooth. Elytral subhumeral sulci long, reaching level of metacoxae. Profemora enlarged, protrochanters with long spine, protibiae lacking modification, mesotibiae lacking denticle. Apical lamina of abdominal sternite VII composed of two sclerites, each curved mesally. Aedeagus with right paramere curved mesally, internal sac bearing several sclerotized spines, lacking hairy sclerite.

Description. Male ( Fig. 11 A). Length 2.21 mm. Head longer than wide, HL 0.48 mm, HW 0.44 mm, lacking median vertexal carina; lateral portions of frons relatively smooth; each eye composed of about 33 facets. Antennomere XI ( Fig. 11 B–C) with impression surrounding moderately prominent disc-like protuberance near base, diameter of impression about two-fifths of segmental length. Pronotum wider than long, PL 0.48 mm, PW 0.55 mm, relatively smooth. Profemora strongly enlarged, protrochanters with long spine ( Fig. 11 D), protibiae lacking modification, mesotibiae lacking denticle. Elytra wider than long, EL 0.84 mm, EW 0.90 mm, smooth; subhumeral sulci long, reaching level of metacoxae. Abdomen wider than long, AL 0.43 mm, AW 0.83 mm; abdominal tergite IV (first visible tergite) with discal carinae extending to two-fifths of tergal length; abdominal sternite VII modified ( Fig. 11 E), with apical lamina composed of two sclerites, each curved mesally, apical half of right one slender, gradually narrowed toward apex. Length of aedeagus ( Fig. 11 F) including parameres 0.42 mm (aedeagus with left paramere broken off), with right paramere curved mesally, internal sac bearing several sclerotized spines, lacking hairy sclerite.

Female. Similar to male; antennomere XI, and profemora unmodified. Each eye composed of about 19 facets. Measurements: BL 1.96–2.05 mm, HL 0.42–0.44 mm, HW 0.40–0.43 mm, PL 0.41–0.43 mm, PW 0.54–0.55 mm, EL 0.74–0.75 mm, EW 0.86–0.88 mm, AL 0.40–0.43 mm, AW 0.80–0.81 mm.

Distribution. Eastern China: Anhui.

Etymology. This specific epithet ‘ inaequalis ’ means ‘uneven, unequal’, referring to the shape of the apical lamina of sternite VII.

Figures

FIGURE 11. Diagnostic characters of Triomicrus inaequalis, male. A. Habitus. B. Antennal club, in dorsal view. C. Same, in lateral view. D. Protrochanter. 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.