An Updated Checklist of Land and Freshwater Gastropod Fauna on Ulleung Island, South Korea

We investigated nonmarine gastropod fauna on Ulleung Island, an oceanic island in South Korea. Surveys were conducted in June and September 2018, which newly recorded four terrestrial gastropod species (Paludinellassiminea cf. japonica (Pilsbry, 1901), Vallonia costata (Muller, 1774), Meghimatium cf. bilineatum (Benson, 1842) and Ambigolimax sp.) and two freshwater snails (Galba truncatula (Muller, 1774) and Physella acuta (Draparnaud, 1805)). All records of nonmarine gastropods obtained from Ulleung Island so far were compiled as well.