Three Egyptian trematodes of fish-eating mammals of family Cyathocotylidae (Poche, 1926).

Fifty-eight specimens of cyathocotylid flukes were collected from dogs fed on the fish Clarias lazera: 10 Duboisia, 27 Mesostephanus appendiculatus; and 21 Prosostephanus industrius. This is the first time that these genera have been identified as parasites of C. lazera. The danger of human infection with these trematodes by means of C. lazera and other commercially important fish is stressed.