Two Poecilostomatoid Copepods, Anthessius graciliunguis n. sp. and Modiolicola bifidus TANAKA, 1961 from the Blue Mussel, Mytilus edulis galloprovincialis LAMARCK, in Japan

Abstract

Anthessius graciliunguis n. sp. is described based on the adult female recovered in the mantle cavity of Mytilus edulis galloprovincialis LAMARCK taken from the Himeji Harbor, Japan. This is the fifth poecilostomatoid copepod known from the blue mussel in Japanese waters. Modiolicola bifidus TANAKA is redescribed based on the newly collected specimens from M. edulis galloprovincialis in Himeji Harbor and Ehime, Japan. The mussel is a new host to M. bifidus.