Peltodytes intermedius (Sharp,1873)

Hayashi, Masakazu, Iwata, Tomofumi & Yoshitomi, Hiroyuki, 2023, Revision of the family Haliplidae (Insecta, Coleoptera) in Japan, ZooKeys 1168, pp. 267-294 : 267

Peltodytes intermedius (Sharp,1873)

Figs 2 , 18A Japanese name: Kogashira-mizumushi

Cnemidotus intermedius Sharp, 1873: 55.

Peltodytes intermedius : Kamiya 1936: 39; 1951: 122; Satô 1985: 181; Nakane 1963a: 55; 1987: 27; Matsui 1992: 2; Vondel 1995: 124; 2003a: 33; Takahashi 1998: 6; Dejima 2007: 83; 2010: 43; Tomisawa 2012: 42; Yoshitomi 2014: 25; Matsuo and Fukagawa 2016: 50; Mitamura et al. 2017: 136; Hayashi and Kadowaki 2019: 25; Nakajima et al. 2020: 19; Nakamine and Nakamine 2021: 2.

Material examined.

1 ex., Ehime Prefecture : Hakata-jima, 14-15. VIII.1997, H. Nakanishi leg. (EUMJ) ; 1 ex., Ehime Prefecture : Iwagi-jima, 16.VIII.1997, H. Nakanishi leg. (EUMJ) ; 1 ex., Ehime Prefecture : Ômi-shima, 13.VIII.1997, H. Nakanishi leg. (EUMJ) ; 3 exs., Ehime Prefecture : Ôshima, 23.V.1998, H. Nakanishi leg. (EUMJ) ; 1 ex., Ehime Prefecture : Ôshima, 13.VIII.1997, H. Nakanishi leg. (EUMJ) ; 1 ex., Kagoshima Prefecture : Chaban, Yoron-to, 10.VIII.1958, S. Ueno & Y. Morimoto leg. (EUMJ). Other specimens are listed in Suppl. material 1 .

Measurements

(n = 10). TL 3.38-4.82 (4.48) mm; HW 0.69-0.78 (0.73) mm; CED 0.19-0.23 (0.21) mm; PL 0.62-0.71 (0.67) mm; PW 1.45-1.64 (1.52) mm; EL 2.34-2.67 (2.45) mm; EW 1.86-2.16 (1.98) mm; BT 1.41-1.65 (1.53) mm; HW/CED 3.22-3.83 (3.49); PW/PL 2.18-2.35 (2.27); EL/EW 1.17-1.27 (1.22).

Biology.

This species typically inhabits stagnant water environments such as ponds, paddies, and swamps ( Nakajima et al. 2020). The larvae primarily feed on Zygnemataceae algae. The adults were collected using a sweep net in shallow water or captured by a light trap. A pupal chamber was observed within the mud in rearing condition ( Hayashi 2015).

Immature stages.

The larva was described by Fukuda et al. (1959) and illustrated in color by Mitamura et al. (2017) and Nakajima et al. (2020).

DNA barcodes.

The sequences of COI (Cox1) gene of Japanese specimens are deposited in DNA Data Bank of Japan (DDBJ) ( Hayashi and Ooi 2022): Aomori Prefecture (LC633200), Shimane Prefecture (LC633201-LC633205).

Distribution.

Japan: Hokkaido, Honshu, Shikoku, Kyushu, Sado, Izu-shoto, Noto-jima of Nanao-wan in Ishikawa, Oki, Awaji-shima, Shodo-shima, Te-jima in Kagawa, Geiyo-shoto in Seto-naikai (new records) (Iwagi-jima, Ômishima, Hakata-jima, Ôshima), Tsushima, Iki, Hirado-jima in Nagasaki, Goto-retto, Taka-shima of Imari-wan in Nagasaki, Tobase-jima of Yatsushiro-kai in Kumamoto, Amakusa-shoto in Kumamoto, Nansei shoto (Tanegashima, Yoron-jima: new record); Korea, China, Taiwan, Far East of Russia.

Figures

Figure 2. Peltodytes intermedius 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).

Figure 18. Distribution maps based on specimens examined A Peltodytes intermedius B Peltodytes sinensis C Haliplus japonicus D Haliplus kamiyai (circle), Haliplus morii (star), Haliplus regimbarti (square) E Haliplus simplex (black circle), Haliplus angustifrons (white circle) F Haliplus basinotatus (black circle), Haliplus kotoshonis (white circle).