Fabaeformiscandona japonica (Okubo, 1990)

(Figs 6 B–D, 7C–D)

1990b Candona japonica n. sp. —Okubo: 40, 42, Figs. 1 j–r.

nov. comb. 2001 Fabaeformiscandona japonica (Okubo, 1990) —Shornikov & Trebukhova: 64.

Material examined. One female from Upo-nup swamp (Jjokjibeol), Changnyeong (35°32′53″N, 128°24′0 9″E) (locality 11 on Fig. 1), 27 July 2010. Three males from a lotus field near Daegu University in Gyeongsan (35º53′54.73″N, 128º51′23.40″E) (locality 10 on Fig. 1), 3 April 2010. Four males and four females from the discharges of small springs flowing from limestone outcrops along the banks of a shallow, fast flowing stream at Oksan-ri, Angang-up, Gyeongju-si, Gyeongsangbuk-do (36º01′0 1.7″N, 129º09′35.7″E) (locality 9 on Fig. 1), 7 June 2011.

Remarks. This is the first report of this species from the Korean Peninsula. The male sexual organ has a slightly larger a lobe compared with Japanese specimens (Fig. 6 D). The female carapace is also slightly more inflated posteriorly and the ventral margin is more concave than Japanese specimens (Fig. 7 D). It is a fairly widespread species, known from rather disjunct regions such as Japan and Spain (Okubo 1990b; Smith & Kamiya 2007; Smith & Janz 2008; Mezquita & Sanz-Brau 1997). It is usually found in lakes, ponds, irrigated fields and irrigation ditches. Its presence in the discharges of springs at Angang-up (see material examined section above) together with numerous Eucypris pigra is unusual in this respect.