Genus: Ovoid or subspherical; with two flagella and radiating axopodia, all arising from an
eccentric centriole; nucleus eccentric; pseudopods sometimes withdrawn; fresh water (Kudo, 1966).
Species: Spherical cell body (heliozoan type) 15-22 μm in diam. (Page & Siemensma, 1991).
Dimorpha ?, morphological change from heliozoa to flagellate stage,
x 400, x 640, Mizumoto Park, Katsushika-ku, Tokyo, Japan, July 2001 by Y. Tsukii
31 μm 63 μm 94 μm; x 640
Heliozoa stage with flagella, cell body spherical, 14 μm in diam.
Heliozoa stage with flagella, cell body spherical, 9 μm in diam.
D. mutans Gruber: 15-20 μm diam.;
flagella about 20-30 μm long (Kudo, 1966).
D. floridanis Bovee: Flagellate phase 18-20 μm long, 6-7 μm wide; two flagella 10-12 μm long, one directed anteriorly and the other bent laterally; heliozoan form 8-10 μm diam.; fresh water (Kudo, 1966).