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).

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A. eichhornii ? intact cells Japan, 1997	A. eichhornii ? well fed Japan, 1997	A. eichhornii ? intact cells Japan, 199?	A. eichhornii ? 210 μm φ Lake Nojiri Shinano Nagano, 2004
A. eichhornii ? 170 μm φ Iono michino-eki Nasu Tochigi, 2004 Movies	A. eichhornii 220 μm φ Fujimitashiro Oze marsh Gunma, 2007	A. eichhornii 168 μm φ near Karakemi m. Omachi Nagano, 2005
A. nucleofilum ? intact cells Japan, 1997	contractile vacuole Japan, 1997	cysts Japan, 1997
feeding ingesting Stentor Japan, 1997	feeding trapping a ciliate Japan, 1998	as a pray by Amoeba Japan, 1998	cell division A. aculeata ? Japan, 1998
cell division aculeata ? Higashi-hiroshima Hiroshima, 1998 Movies	Actinosphaerium ? μm Higashi-hiroshima, Hiroshima, 1998 Movies	Actinosphaerium sp. μm Higashi-hiroshima, Hiroshima, 1998
Actinosphaerium sp. with endosymbionts ? Kareki-numa Nikko Tochigi, 2008	Actinosphaerium sp. μm φ Kashibaru m.5 Karatsu Saga, 2008

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