Stein, 1867
Body ellipsoidal, dorsoventrally flattened. With regular ciliation on ventral surface only. Lateral edges and dorsal surface bear short stiff spines, associated in latter location with wart-like prominences. Adoral membranelles conspicuous at apical end of body, curving down left side to mouth located in anterior 1/3 of cell. Two ovoid to spherical macronuclei. Generally marine, also in salt marshes. In some characteristics rather similar to hypotrichs.
Planctonic species recorded:
Peritromus emmae