Revision of the family Haliplidae (Insecta, Coleoptera) in Japan Author Hayashi, Masakazu https://orcid.org/0000-0003-3708-9005 Hoshizaki Green Foundation, Sono, Izumo, 691 - 0076, Japan hgf-haya@green-f.or.jp Author Iwata, Tomofumi https://orcid.org/0000-0002-7738-3199 Toyama Science Museum, 1 - 8 - 31 Nishinakano-machi, Toyama, 939 - 8084, Japan Author Yoshitomi, Hiroyuki https://orcid.org/0000-0001-8416-9249 Entomological Laboratory, Faculty of Agriculture, Ehime University, Tarumi 3 - 5 - 7, Matsuyama, 790 - 8566, Japan hymushi@agr.ehime-u.ac.jp text ZooKeys 2023 2023-07-03 1168 267 294 http://dx.doi.org/10.3897/zookeys.1168.99302 journal article http://dx.doi.org/10.3897/zookeys.1168.99302 1313-2970-1168-267 28659D393708403584BFA95AC91C59FF 01F93FFC6397552587D46E5748153639 Haliplus (Nipponiplus) japonicus Sharp, 1873 Figs 4 , 18C Japanese name: Kubiboso-kogashira-mizumushi Haliplus japonicus Sharp, 1873: 55. Kamiya 1936 : 44; Sato 1985 : 181; Nakane 1963a : 55; 1985 : 62; 1987 : 29; Matsui 1992 : 2; Vondel 1995: 122; Tomisawa 2012 : 42; Matsuo and Fukagawa 2016 : 51; Mitamura et al. 2017 : 138; Hayashi and Kadowaki 2019 : 25; Nakajima et al. 2020 : 20. Haliplus (Haliplus) japonicus : Sato , 1984: 1; Vondel 2003a: 31; Vondel et al. 2006: 250. Haliplus (Nipponiplus) japonicus : Vondel 2019: 22. Haliplus brevior Nakane, 1963a: 55. Nakane 1985 : 62; 1987 : 29. [synonymized with H. minutus by Sato (1984) but with H. japonicus by van Vondel et al. (2006) ] Material examined. Specimens examined in this study are listed in Suppl. material 1. Figure 4. Haliplus japonicus A habitus B head C prosternal process D penis E left paramere F right paramere. Scale bars: 1.0 mm ( A ); 0.5 mm ( B ); 0.25 mm ( C ); 0.1 mm ( D-F ). Measurements ( n = 10). TL 2.69-4.08 (3.79) mm; HW 0.62-0.69 (0.67) mm; CED 0.29-0.32 (0.30) mm; PL 0.55-0.66 (0.62) mm; PW 1.05-1.20 (1.12) mm; EL 1.99-2.20 (2.10) mm; EW 1.50-1.71 (1.60) mm; BT 1.12-1.28 (1.19) mm; HW/CED 2.12-2.35 (2.24); PW/PL 1.65-2.04 (1.76); EL/EW 1.25-1.34 (1.32). Biology. This species usually lives in fresh waters with abundant aquatic plants such as ponds, paddies, and streams ( Nakajima et al. 2020 ). The larvae eat Zygnemataceae algae ( Hayashi 2015 ). The adults were collected by sweep netting in shallow waters and are rarely attracted by light traps ( Hayashi 2015 ). The pupation in mud with a pupal chamber was accomplished by laboratory rearing ( Hayashi 2015 ). Immature stages. The color photographs were provided by Mitamura et al. (2017) and Nakajima et al. (2020) . Distribution. Japan: Hokkaido, Honshu, Shikoku, Kyushu, Noto-jima, Oki, Goto-retto, Taka-shima, Amakusa-shoto; China, Far East Russia.