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Frontonia is a genus of free-living unicellular ciliate protists, belonging to the order Peniculida. As peniculids, the Frontonia are closely related to members of the genus Paramecium. However, whereas Paramecia are mainly bacterivores, Frontonia are capable of ingesting large prey such as diatoms, filamentous algae, testate amoebas, and even, in some circumstances, members of their own species.Photograph credit: Wiedehopf20