Sarothrias sinicus Bi & Chen, 2015

Yin, Zi-Wei & Bi, Wen-Xuan, 2018, New and little known Jacobsoniidae (Coleoptera) from China, Acta Entomologica Musei Nationalis Pragae 58 (1), pp. 11-16 : 15

Sarothrias sinicus Bi & Chen, 2015

Chinese common name: ƤŖDaem ( Figs 1B , 3E–I )

Sarothrias sinicus Bi & Chen, 2015: 54 .

Material examined. CHINA: XIZANG: 1 (holotype), ‘China: Xizang, Motuo ( ḄȒ), Baricun ( BHIJ), 2014.vii.27, 1850 m, leg. Wen-Xuan Bi.’ ( SNUC) . YUNNAN: 1, ‘China: Yunnan, Lushui (ẘḳh), Pianma (Rĥ), Gangfang (Ṅae) (ca. 26°00’N, 98°37’E), 2100 m, 2.v.2015, leg. Wen-Xuan Bi’ ( SNUC).

Supplementary description. Habitus of male from Yunnan as in Fig. 1B . Tergite VII ( Fig. 3E ) with rounded apical margin slightly incised at middle; sternite VIII and genital segments as in Fig. 3F . Aedeagus strongly sclerotized, in ventral view ( Fig. 3G ) tapering at the apex, in lateral view ( Figs 3H–I ) curved, constricted near base, evenly broadening to its maximum width at basal 1/4, and then gradually narrowing toward apex. Measurements (holotype in parentheses): body length 2.44 (2.45) mm, length of head from anterior margin of clypeus to base 0.33 (0.36) mm, width across eyes 0.46 (0.45) mm, length of antenna 0.87 (0.90) mm, length of pronotum along midline 0.72 (0.70) mm, maximum width of pronotum 0.51 (0.51) mm, length of elytra along suture 1.39 (1.39) mm, maximum width of elytra 0.81 (0.81) mm, elytral index (length/width) 1.72 (1.72), length of aedeagus 0.56 (n/a) mm.

Distribution. Southwest China: Yunnan (new provincial record), Xizang.

Comments. Since the body size, proportions of the body segments, patterns of the secretion on the head, pronotum, and elytra, and the arrangement of discal rows and punctation on the elytra are extremely similar, and there is no defining character that can be used to consistently separate the populations of Yunnan and Tibet, we treat these two populations as conspecific. The male from Yunnan has the punctures of the pronotal disc slightly smaller, and basal half of the aedeagal median lobe slightly narrower than those from Tibet. Given that there is a 500 km gap in between, this difference is interpreted as intraspecific variation.

Figures

Fig. 1. Male habitus of Sarothrias. A – S. songi sp. nov.; B – S. sinicus Bi & Chen, 2015. Scale bars: 0.5 mm.

Fig. 3. Morphological details of Sarothrias songi sp. nov., male (A–D), and S. sinicus Bi & Chen, 2015, males from Yunnan (E–H) and Tibet (I). A, E – tergite VII; B, F – sternite VIII and genital segments. C–D, G–I – aedeagus, in ventral (C, G) and lateral (D, H–I) view. Note: the aedeagus of the holotype of S. sinicus (I) is partially broken at the apex. Scale bars: 0.2 mm.