Nonmarine Ostracoda (Crustacea) from Jeju Island, South Korea, including descriptions of two new species Author Smith, Robin James Lake Biwa Museum, Kusatsu, Shiga, Japan; Author Lee, Jimin Marine Ecosystem Research Division, Korea Institute of Ocean Science and Technology, Ansan, Korea; Author Chang, Cheon Young Department of Biological Science, College of Natural Sciences, Daegu University, Gyeongsan, Korea text Journal of Natural History 2014 2014-06-30 49 1 37 76 journal article 21101 10.1080/00222933.2014.946110 09639ec6-6fbb-42e3-aab5-9a3ed49c09cd 1464-5262 4002512 Cypretta seurati Gauthier, 1929 ( Figure 5F–J ) Remarks Adult females collected from Jeju Island showed a large size range from 620 through to 709 μm in length (Appendix 1). The dorsal view was noticeably variable in shape, with a width/length ratio ranging from 0.74 through to 0.81 ( Figure 5I, J ), and with the position of maximum width ranging from a position 38 to 43% of the length from the posterior margin (Appendix 1). This large variation may indicate that cryptic species exist within this widespread parthenogenetic form. Cypretta seurati is widespread in circum-tropical regions and warmer areas of temperate zones ( Meisch et al. 2007 ). It has previously been reported from Korea , including Jeju Island, by Kim and Min (1991a) . In our surveys, it was collected from 10 localities (4, 10, 14, 17, 25, 26, 28, 29, 32 and 35) from a wide range of habitats, including marshes, seeps, irrigation ponds, natural pools, and rivers.