However, whereas Paramecia are mainly bacterivores, Frontonia are capable of ingesting large prey such as diatoms, filamentous algae, testate amoebas,[1] and even, in some circumstances, members of their own species.

[3] Frontonia are widely dispersed, and members of the genus can be found in marine and freshwater environments on every continent.

The mouth is supported by inconspicuous microtubular rods (nematodesmata),[8] and may expand during feeding to as much as two-thirds of the cell's length.

[10] In 2008, analysis of small subunit rRNA gene sequences confirmed the close relationship of several members of the genus: Frontonia leucas, F. vernalis, F. tchibisovae, F. lynni.

This result calls into question the monophyly of the genus Frontonia, and also casts doubt on the morphological criteria used to distinguish Apofrontonia from it.