Pulicitrogus compressus gen. nov., sp. nov. (Copepoda, Siphonostomatoida, Artotrogidae) associated with an ascidian in the Sea of Japan

Pulicitrogus compressus gen. nov., sp. nov., an ecto-associate of the ascidian Halocynthia hilgendorfi igaboja (Oka), is described on the basis of female and male specimens from the Korean coast of the Sea of Japan. This copepod is unique in having a laterally compressed body, with a reduced armature on the legs.