Family:
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).

Actinosphaerium sp. 4 clips μm xxxx Pref, Year	Actinosphaerium sp. 4 clips μm Higashi-hiroshima Hiroshima, 1998	Actinosphaerium sp. 4 clips μm Higashi-hiroshima Hiroshima, 1998
Actinosphaerium sp. 4 clips μm Higashi-hiroshima Hiroshima, 1998	Actinosphaerium sp. 3 clips μm Higashi-hiroshima Hiroshima, 1998	Actinosphaerium sp. 3 clips μm Higashi-hiroshima Hiroshima, 1998
Actinosphaerium sp. 5 clips μm Iono michino-eki Nasu Tochigi, 2004