The systematics and ecology of some cirolanid isopods from southern Japan

Abstract
Descriptions are given of Cirolana coronata sp. nov., Eurydice nipponica sp. nov., and C. harfordi japonica from deep water, sand, and rocky shore habitats respectively in Japan. Excirolana japonica, E. kincaidi, and E. vancouverensis, are considered to be only geographical variations of E. chiltoni which now has a circumnorth Pacific distribution. C. australiense is reported for the first time from Japanese waters, and the sub species C. harfordi japonica Thielemann is confirmed by comparison with C. harfordi harfordi Lockington from California. The ecology of the two latter species is briefly compared.