Candona japonica, Chang, Cheon Young, Lee, Jimin & Smith, Robin J., 2012

Chang, Cheon Young, Lee, Jimin & Smith, Robin J., 2012, Nonmarine ostracods (Crustacea) from South Korea, including a description of a new species of Tanycypris Triebel (Cyprididae, Cypricercinae), Zootaxa 3161, pp. 1-19 : 15

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.

Figures

FIGURE 1. Localities. 1, Daegwanryeong Hill, Gangreung; 2, Deokgu Valley, Uljin; 3, estuary of Wangpicheon Stream, Uljin; 4, Yecheon; 5, Okgye Valley, Yeongdeok; 6, estuary of Goggangcheon Stream, Pohang; 7, Guryongpo, Pohang; 8, Hyeongsan River, Gyeongju; 9, Oksancheon Stream, Gyeongju; 10, Gyeongsan; 11, Upo-nup Swamp (Jjokjibeol), Changnyeong; 12, Hambak Mountain, Changnyeong; 13, Jilnal-nup Swamp, Haman; 14, Junam Reservoir, Changwon; 15, Samnak Wetland Park, the Nakdong River, Busan; 16, Dadaepo Beach, Busan.

FIGURE 6. A, Scottia pseudobrowniana, Hp (DB 40019). B – D, Fabaeformiscandona japonica (DB 40020). B, left male L 5 palp. C, right male L 5 palp. D, Hp. E – G, Physocypria nipponica (DB 40021). E, left male L 5 palp. F, right male L 5 palp. G, Hp.

FIGURE 7. A, Cryptocandona brehmi, left valve, internal view (DB 40022). B, Cryptocandona tsukagoshii, right valve, internal view (DB 40023). C – D, Fabaeformiscandona japonica. C, male right valve, internal view (DB 40020). D, female right valve, internal view (DB 40024). E – G, Physocypria nipponica. E, left lateral view of whole carapace (DB 40025). F, left valve, internal view (DB 40026). G, right valve, internal view (DB 40026). H – K, Vestalenula cylindrica. H, right valve, internal view (DB 40027). I, left valve, internal view (DB 40027). J, dorsal view, anterior to right (DB 40028). K, right valve, ventral view (DB 40027). Scale bar = 333 µm for A – B, 340 µm for C – D, 257 µm for E – G, 162 µm for H – K.