Pseudanthessius spinosus, a new species of Copepoda (Poecilostomatoida, Pseudanthessiidae) Associated with the Echinoid Clypeaster japonicus from Korea

Abstract

Pseudanthessius spinosus n. sp. is described as an associate of the sea urchin Clypeaster japonicus Döderlein from Cheju Island in Korea. The new species may be easily distinguished from its congeners by having four spines and five setae on the third exopodal segment of leg 4. It is the second known species of the genus from Korean waters.