Darwinula cylindrica, 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 : 16

Vestalenula cylindrica Straub, 1952

( Fig 7 H–K)

1952 Darwinula cylindrica n. sp. —Straub: 497, figs 19–20.

nov. comb. 2001 Vestalenula cylindrica ( Straub, 1952) —Janz et al.: 185, pl. 3 (22–26). 2008 Vestalenula sp.—Smith & Kamiya: 275–302, figs 15–17.

Material examined. Five females from wet sediment below water seeping down a near vertical rock face at Oksan-ri, Dalsan-myeon, Yeongdeok-gun, Gyeongsangbuk-do (36º20′38.4″N, 129º16′28.8″E) (locality 5 on Fig. 1 ), 5 June 2011.

Remarks. The lateral view of the carapace (height:length ratio = 0.44–0.47) and relative length of the keel on the right valve (ca. 26% of length of right valve) of the Korean specimens closely match Vestalenula cylindrica from Japan. However, the Korean specimens are notable in two ways: they are smaller (length 400–438 µm for Korean specimens, 461–481 for Japanese specimens), and the Gm claw on the antenna is relatively longer (ca. 75% the length of GM, compared with ca. 50% of GM for Japanese V. cylindrica ). Previously, only one living population of V. cylindrica was known, in Lake Biwa, Japan, although fossils of this species have been recovered in Europe and the Middle East (see Smith & Janz 2009 for review of fossil records).

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 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.