Genus: Ectoplasm consists of large vacuoles in one or several layres; endoplasm with numerous small
vacuoles; numerous nuclei; axopodia end in the inner zone of ectoplasm (Kudo, 1966).
Species:
Actinosphaerium nucleofilum Barrett, 1958,
cell body spherical, μm in diam.,
x 200 & x 400, Japan 1997 by Y. Tsukii
50 μm
100 μm
150 μm; x 400