Abstract
Parasitological surveys were carried out of goldfish, Carassius auratus and carp, Cyprinus carpio from April, 1977 to Feburuary, 1979, and six species of Dactylogyrus (Monogenea, Dactylogyridae) were recovered; D. dulkeiti, D. formosus, D. anchoratus, D. baueri, D. intermedius and D. vastator from goldfish and D. anchoratus from carp. D. dulkeiti, D. formosus, D. anchoratus, D. baueri and D. intermedius are first recorded in Japan. Descriptions are given of the chitinous parts of the above species and also of the internal structures in D. dulkeiti and D. formosus.
At present, six species of Dactylogyrus mentioned above from goldfish and three species (D. anchoratus, D. extensus and D. minutus) from carp have been reported in Japan.
