Genus (Ehrenberg, 1830): Spheroidal; cytoplasm vacuolated, especially ectoplasm; nucleus central;
one to many contractile vacuoles; axopodia straight, axial filaments terminate at surface of the
nucleus (Kudo, 1966).
Species: Ectoplasm vacuolated; a large central nucleus; diameter average
40-50 μm (Kudo, 1966).
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