Trichodina

Trichodina
Scanning electron micrograph of Trichodina on the gills of a mullet
Scientific classification
Domain: Eukaryota
Clade: Sar
Clade: Alveolata
Phylum: Ciliophora
Class: Oligohymenophorea
Order: Mobilida
Family: Trichodinidae
Genus: Trichodina
Ehrenberg, 1830

Trichodina is a genus of ciliate alveolates that is ectocommensal or parasitic on aquatic animals, particularly fish. They are characterised by the presence of a ring of interlocking cytoskeletal denticles, which provide support for the cell and allow for adhesion to surfaces including fish tissue.