Abstract
Recently IVASHKIN et al. (1971) reidentified a nematode of the carp in Russia, which was first classified as Philometra lusiana by VISMANIS in 1966, as a member of the genus Philometroides. The present author compared in morphological discription P. lusiana with P. cyprini (ISHII, 1931) NAKAJIMA, 1970 which has long been known as a common parasite of cultured carp in Japan and was first reported by ISHII as a Filalia of carp in 1916 and named F. cyprini by him in 1931. No essential difference could be found out in morphology and parasitism between the two species and therefore it was suggested that the former might be a synonym for the latter.
