Prosthogonimus ovatus

Prosthogonimus ovatus is a species of a trematodes, or fluke worms, in the family Prosthogonimidae.

Life cycle
The first intermediate hosts of Prosthogonimus ovatus include freshwater snails:
 * Anisus spirorbis
 * Bithynia leachii
 * Bithynia tentaculata
 * Planorbarius corneus

The definitive host lives in the oviducts of corn crake Crex crex.