Abstract
Four species of trichodinid ectoparasites (Ciliophora: Peritrichida) were collected from the gills of the following River Nile fish in Egypt:
Hydrocynus forskalii,
Mormyrus kannume,
Schilbe mystus. These species are:
Trichodina heterodentata Duncan, 1977,
Trichodina fahaka sp. n.,
Trichodinella epizootica Raabe, 1950,
Tripartiella dactylodentata sp. n. Photomicrographs and morphometric data are presented for each species.