Jankowski, 1980
Cytostomal-cytopharyngeal structures apical or antapical, in some genera strongly reduced and probably functionless; oral basket (rhabdos) without nematodesmata and bulge microtubules, but probably with transverse ribbons; somatic ciliation limited to two cirri-like girdles; dorsal brush absent; toxicysts present; often with incomplete cryptomonad symbionts. Might belong to another subclass because of morphologic peculiarities (Foissner and Foissner, 1988).
Family Mesodiniidae