Foliomolgus cucullus, a new genus and species of Clausidiidae (Crustacea: Copepoda: Poecilostomatoida) associated with a polychaete in Korea

Foliomolgus cucullus, new genus and species, is described as an associate of the polychaete Marphysa sanguinea (Montagu) inhabiting the intertidal sands in Jeju Island in Korea Strait. The new genus possesses primitive features such as the complete segmentation and setation of rami on legs 1-4, 7-segmented antennule, 4-segmented antenna, and 5-segmented female urosome. It possesses also characteristic features such as a spatulate distal segment of the maxilla, foliaccous ventral elements and rudimentary dorsal claw on the mandible, atrophied distal segment of the antenna, and no maxilliped in the female.