Genus: Body spherical or oval; one or two yellowish-brown chloroplasts
(How to know the protozoa, 1779).
Flagellate often becoming amoeboid or palmelloid; a single external flagellum emerging apically;
second very short flagellum in a pocket detected when examined by electron microscopy;
1 or 2 chloroplasts; eyespot present in some species;
cysts smooth or ornamented; many species with peripheral muciferous bodies;
discobolocysts (a kind of extrusome) in some species;
freshwater or marine (Illustrated Guide, 1985).