Genus: Test with 2 pseudostomes; with thin, organic test (Illustrated Guide, 1985).
Species: Colonial or solitary; cell body spherical (8-20 μm in diam.), covered with a delicate hyaline membrane; two pseudostomes situated at or near two opposite poles; cytoplasm colorless, transparent, finely granular, filling the envelope (test) except near the two pseudostomes; a single nucleus with a nucleolus; one large, or two or three small, colored, oil-like globules present; pseudopodia extremely attenuate, radiating, straight or dichotomously branced, emanating each pseudostome; reproduction by fission or tetrad division
Images of collecting locality:
No.10 (Suimei-no-hotori), Kannon-numa Forest Park (pond), Shimogo town, Fukushima Pref., Japan, November 15, 2008, by Y. Tsukii