1970 年 5 巻 1 号 p. 21-24
A large number of encapsuled, philometrid nematodes were obtained from the fin and operculum of a right-eyed flounder, Limanda yokohamae, which was collected in Otsuchi Bay, Iwate Prefecture, in August, 1966. The present specimens closely resemble Philometpra mariae LAYMAN;this species was detected from the fin of Protopsetta herzensteini and Limanda sehrenki and the ovary of Sebastodes schlegelii in Peter the Great Bay. LAYMAN's description and figures are not detailed, and the present specimens are generally larger than LAYMAN's ones (Table 1). In philometrid nematodes, however, the size of the same species varies so much that the size is of little classificatory importance. The two worms were collected from the fin of the same pleuronectid fishes in the neighboring seas. Consequently, the present specimens are considered to belong to Philometra mariae. On the other hand, this species also resembles Clavinema parasiluri YAMAGUTI, 1935, which was obtained from the operculum and submaxilla of the catfish, Parasilurus asolus, in Lake Ogura, Kyoto. RASHEED(1963) revised the genus Philometra and asserted the invalidity of the genus Clavinema;main reason was the immaturing of C.parasiluri. Classificatory discussion is postponed to another occasion, however, it is conceived that the genus Clavinema is valid and Philometra mariae is transferred to the genus Clavinema.