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Scientific classification
(unranked): SAR
Superphylum: Heterokonta
Phylum: Placidozoa
Class: Opalinea
Order: Opalinida
Family: Opalinidae
Genus: Opalina
Purkinye & Valentin, 1835

Opalina is a genus of parasitic heterokonts found in the intestines of frogs and toads. They lack mouths and contractile vacuoles, they are covered with nearly equal flagelliform cilia, and they have numerous nuclei, all similar. All the species are obligate endosymbionts, most likely commensal rather than parasitic, in cold-blooded vertebrates. Its body is leaflike in shape. They lack cytostomes. They are saprozoic, consuming dead matter, which suggests their commensal role. They propagate by means of plasmotomy.

An example of a species is Opalina ranarum.[1]


 This article incorporates text from a publication now in the public domainChisholm, Hugh, ed. (1911). "Opalina". Encyclopædia Britannica. 20 (11th ed.). Cambridge University Press. p. 121.