Triomicrus mangshanensis, Shen, Jia-Wei & Yin, Zi-Wei, 2016

Shen, Jia-Wei & Yin, Zi-Wei, 2016, The genus Triomicrus Sharp from central and southwestern China (Coleoptera: Staphylinidae: Pselaphinae), and a revised key to the Chinese species, Zootaxa 4097 (3), pp. 369-380 : 370-371

Triomicrus mangshanensis , new species

( Fig. 1 )

Type material (1 ♂, 1 ♀). Holotype: China: ♂, labeled ‘ China: Hunan Prov., Yizhang Hsien (宜章县), Mangshan N. R. (莽山), 08.vi.2004, Jian-Hua Huang leg.’ ( SNUC). Paratype: China: 1 ♀, same data as the holotype ( SNUC).

Diagnosis. Antennomere XI with impression surrounding moderately prominent, disc-like protuberance near base. Head lacking median vertexal carina. Pronotum sparsely punctate. Elytral subhumeral sulci short. Profemora simple, protrochanters and protibiae simple, mesotibiae simple. Abdominal sternite VII modified (apical margin of the lamina partially broken). Aedeagus with right paramere curved mesally, internal sac bearing several sclerotized spines and several densely setose sclerites.

Description. Male ( Fig. 1 A). Length 1.90 mm. Head wider than long, HL 0.33 mm, HW 0.41 mm, lacking median vertexal carina; lateral portions of frons coarsely and sparsely punctate; each eye composed of about 36 facets. Antennomere XI ( Fig. 1 B, 1C) with impression surrounding moderately prominent, disc-like protuberance near base, diameter of impression about two-fifths of segmental length. Pronotum wider than long, PL 0.38 mm, PW 0.48 mm, sparsely punctate. Profemora simple, protrochanters and protibiae lacking protuberance nor spine, mesotibiae lacking apical spur. Elytra wider than long, EL 0.78 mm, EW 0.78 mm, smooth; subhumeral sulci short, barely reaching half of elytral length. Abdomen wider than long, AL 0.43 mm, AW 0.70 mm; abdominal tergite IV (first visible tergite) with discal carinae extending to apical three-fifths of tergal length; abdominal sternite VII modified ( Fig. 1 D; apical margin of lamina partially broken). Length of aedeagus ( Fig. 1 E) including parameres 0.28 mm, with right paramere strongly curved mesally, internal sac bearing several sclerotized spines and several densely setose sclerites.

Female. Similar to male; antennomere XI unmodified. Each eye composed of about 18 facets. Measurements: BL 1.80 mm, HL 0.33 mm, HW 0.39 mm, PL 0.38 mm, PW 0.48 mm, EL 0.68 mm, EW 0.77 mm, AL 0.40 mm, AW 0.70 mm.

Distribution. Central China: Hunan.

Comments. The new species is morphologically closest to T. abhorridus Shen, Yin & Li, 2015 a by sharing a similar form of the protuberance of antennomere XI ( Fig. 1 B, 1C), and the structure of abdominal sternite VII ( Fig. 1 D). Males of these two species can be readily separated by the dense and coarse punctation on the pronotal disc in T. abhorridus , and the right aedeagal paramere is slightly curved mesally, while the new species has sparser pronotal punctation ( Fig. 1 A), and the right aedeagal paramere is strongly curved mesally ( Fig. 1 E).

Etymology. This species is named after the type locality, Mangshan Nature Reserve.

Figures

FIGURE 1. Diagnostic characters of male Triomicrus mangshanensis. 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.