Thompson, 1964
Body small, elongate ovoid, sparsely ciliated, with anterior pole conspicuously naked (frontal plate) and one or more caudal cilia at posterior pole; oral ciliature relatively inconspicuous in long and shallow depression, adoral membranelle 1 entirely nonciliferous; scutica bearing cilia. In marine or freshwater habitats, occasionally edaphic.
Planctonic species recorded:
Uronema marinum