Physocypria nipponica Okubo, 1990

(Figs 6 E–G, 7E–G)

1990a Physocypria nipponica n. sp. —Okubo: 3–4, figs 1E–H.

Material examined. Three adults from Jilnal-nup swamp, Haman (35°19′15″N, 128°20′56″E) (locality 13 on Fig. 1), 27 July 2010. Forty-three adults from Upo-nup swamp (Jjokjibeol), Changnyeong (35°32′53″N, 128°24′0 9″E) (locality 11 on Fig. 1), 27 July 2010. Three adults from an overgrown channel with emergent macrophytes on the floodplain of the Nakdong River, Samnak-dong, Sasang-gu, Busan (35º10′22.1″N, 128º58′16.9″E), (locality 15 on Fig. 1), 3 June, 2011. Three adults from a lotus field at Woljam-ri, Dong-eup, Changwon-si, Gyeongsangnam-do (35º18′37.5″N, 128º40′49.7″E), (locality 14 on Fig. 1), depth 30 cm, 4 June 2011. Twenty-three adults from Junam Reservoir at Seoksan-ri, Dong-eup, Changwon-si, Gyeongsangnam-do (35º18′46.8″N, 128º39′54.2″E) (locality 14 on Fig. 1), depth 50 cm, 4 June 2011.

Remarks. This species has been reported from Japan (Okubo 1990a; 2004; Smith & Janz 2008). As noted by Smith & Janz (2008), this species is similar to Physocypria kraepelini Müller, 1903, which has been previously reported from Korea (Lee et al. 2000). Further work is required to determine if P. nipponica is a junior synonym of P. kraepelini or not, but either way it is probable that all the Korean specimens are the same species. Physocypria nipponica has been found in Lake Biwa (depths ranging from 0.01 to 9.6 m) (Smith & Janz 2008), rice fields, and irrigation ponds in Japan (Okubo 1990a; 2004).