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Host-parasite relationships between Paragonimus ohirai and various crabs. I. Morphology of the metacercariae parasitic in Sesarma (Holontetopus) dehaani and S. (H.) haematocheir

According to Miyazaki (1974), 25 species belonging to the genus Paragonimus have been found in the world. In Japan, five species of the lung flukes, viz., P. westermani, P. ohirai, P. iloktsuenensis, P. miyazakii and P. sadoensis have been known up to date. P. ohirai metacercariae are found in the liver, and in the body and leg muscles of the brackish water crabs, Sesarma (Holometopus) dehaani, S. (H.) haematocheir, S. (Sesarma) intermedium, Helice tridens tridens and Chasmagnathus convexus.