Four new species of sand-burrowing Haustoriid Amphipoda (Crustacea) of Korea

During intensive sandy beach sampling of the Korean coasts, only one haustoriid genus, Eohaustorius, which is endemic to the North Pacific, has been revealed. Four new species of this genus are described herein: E. stocki n. sp., E. longidactylus n. sp., E. spinigerus n. sp., and E. setulosus n. sp. Key to the known species and diagnosis of the genus are provided. No morphological differences were found between the male and female of these species except primary sexual characteristics. E. stocki is distributed on the south coast of Korea, whereas E. longidactylus and E. spinigerus are confined to the west coast. The fourth species E. setulosus inhabits both marine and estuarine habitats on the eastern part of the south coast and the southern part of the west coast. Seven beaches were visited in Cheju Island but no haustoriids were encountered.