Chasmogenus orbus Watanabe, 1987

Jia, Fenglong & Tang, Yu-dan, 2018, A faunistic study of genus Chasmogenus Sharp, 1882 of China (Coleoptera, Hydrophilidae), ZooKeys 738, pp. 59-66 : 61-62

Chasmogenus orbus Watanabe, 1987 Fig. 9

Helochares (Crephelochares) orbus Watanabe, 1987: 12 (for detailed description).

Material examined.

CHINA: Hong Kong: 2 males, 5 females (SYSU), Hong Kong, Rongshu’ao, 22°25.641'N, 114°17.410'E, 10m. 11.vi.2014, Fenglong Jia, Weicai Xie & Jiahuang Chen leg. [transcribed from Chinese].

Remarks.

Based on the original description of C. orbus by Watanabe (1987), the specimens here appear completely identical to this species. The senior author has dissected two males and sent photos of the aedeagus to Dr. Minoshima for comparison with Japanese specimens; he informed the senior author (via email) that he did not see any difference between the photos and the specimens from Japan. Similar to C. parorbus sp. n., it can be distinguished from this species by parameres being sharp apically, with the subapical tooth less sharp; and the median lobe broader, not constricted in apical quarter (Fig. 9).

Distribution.

China (Hong Kong); Japan. New for China.