Mobilida

Mobilida
Scanning electron micrograph of Trichodina on the gills of a mullet
Scientific classification
Domain: Eukaryota
Clade: Sar
Clade: Alveolata
Phylum: Ciliophora
Class: Oligohymenophorea
Subclass: Peritrichia
Order: Mobilida
Kahl, 1933
Families

Leiotrochidae
Polycyclidae
Trichodinidae
Trichodinopsidae
Urceolariidae

Mobilida is a group of parasitic or symbiotic peritrich ciliates, comprising more than 280 species. Mobilids live on or within a wide variety of aquatic organisms, including fish, amphibians, molluscs, cnidarians, flatworms and other ciliates, attaching to their host organism by means of an aboral adhesive disk. Some mobilid species are pathogens of wild or farmed fish, causing severe and economically damaging diseases such as trichodinosis.