Class Trematoda, Subclass Digenea
Troglotrematidae: Paragonimus westermanii

Normally a fluke of birds and weasals, one species includes humans and cats as a host. This is the Oriental lung fluke. It can be picked up from eating undercooked crab.


Paragonimus westermanii adult, about 10 mm long. The dark leaf-like structures are the testes (posterior, to the right), ovary (center, above), and uterus (center, near the bottom). The fine networks are the vitellaria. 25x.
Paragonimus westermanii egg. 450x.


Paragonimus westermanii miracidium. 450x.
Paragonimus westermanii redia. 100x.


Paragonimus westermanii cercaria. 100x.
Paragonimus westermanii metacercaria. 100x.