Body obovoid to almost spherical, no anterior protrusion; probably containing sequestered chloroplasts. Peristomial field large, oral cavity separated from ventral surface by cytoplasmic wall. Equatorial kinety continuous or with very small gap ventrally. Ventral kinety usually right of median. Adoral zone continuous and of large diameter, composed of 14-17 anterior and 6-7 ventral adoral membranelles which invaginate on anterior surface. Extrusomes in 1 supraequatorial girdle, about 20 µm long. Subpellicular platelet layer in posterior 2/3 of body. Swims rather slowly, rests briefly and rotates about main body axis. Size in vivo 35-55 x 20-40 µm.
Ref.: Petz et al. (1995a).