During July and August 1985, a field survey on the lung fluke was carried out at six localities in the peninsular Malaysia. A total of 1, 009 freshwater crabs belonging to eight species were examined and
Paragonimus westermani metacercariae were found in four species of the crabs,
Parathelphusa maculata from Kuala Pilah and Ulu Langat,
Parathelphusa malaysiana, Johora tahanensis and
Irmengardia pilosimana from Sungai Wa. The three species of crabs except
Parathelphusa maculata are recorded as new crustacean hosts of
P. westermani. Parathelphusa maculata harboured more than 60% of the total metacercariae in the muscle, 20-25% in the gills and about 10% in the liver, but no metacercariae were found in the heart. In contrast, a substantial number of metacercariae parasitized the heart of the crab,
Parathelphusa malaysiana.
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