Haliplus (Haliplus) simplex Clark, 1863

Figs 11, 18E Japanese name: Chibi-kogashira-mizumushi

Haliplus simplex Clark, 1863: 419. Vondel 1995: 123; Matsuo and Fukagawa 2016: 51; Mitamura et al. 2017: 142; Nakajima et al. 2020: 21.

Haliplus minutus Takizawa, 1931: 140. Kamiya 1936: 45; Satô 1985: 181; Nakane 1985: 62. [synonymized by van Vondel et al. (2006)]

Haliplus (Haliplus) minutus: Satô 1984: 1; Vondel 2003a: 31; Vondel et al. 2006: 265.

Material examined.

Specimens examined in this study are listed in Suppl. material 1.

Measurements

(n = 10). TL 2.49-3.75 (3.54) mm; HW 0.62-0.66 (0.64) mm; CED 0.32-0.35 (0.33) mm; PL 0.57-0.62 (0.59) mm; PW 1.04-1.14 (1.10) mm; EL 1.86-1.99 (1.92) mm; EW 1.50-1.61 (1.55) mm; BT 1.14-1.19 (1.15) mm; HW/CED 1.86-2.02 (1.92); PW/PL 1.75-1.94 (1.84); EL/EW 1.21-1.28 (1.24).

Biology.

This species typically inhabits stagnant water environments such as ponds, paddies, and swamps, and the adults were collected by sweep netting in shallow water (Nakajima et al. 2020).

Immature stages.

Unknown.

Distribution.

Japan: Hokkaido, Honshu (Tohoku Region), Tsushima; Korea, China, Far East of Russia.