Reproduction by budding to form a motile swarmer. Ecto-commensals on crustaceans. Spirochona, Stylachona, Chilodochona. Reproduction simple or multiple budding. Only swarmer cells are ciliated.
Many species form a stalk and lorica.
This class has 3 orders. Ephelota, Podophrya, Ophryodendron, Trophogemma. Kinetosomes of larval kineties first develop around center of larva. Acineta, Tokophrya, Acinetopsis, Dendrosoma, Dendromectes.