Genus: Small amoeba with rapidly changing form; sometimes spatulate or flabellate; hyaline zone usually with smoothly irregular edge; sometimes deeply divided; one known species ? (Page, 1976).

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R. ithacus ? 13-19 x 31-44 μm n. μm φ Japan, 1998

Rosculus sp. ? Torinome-Kasen p. Nasu-shiobara Tochigi, 1998

Rosculus sp. ? 70-100 x 10-17 μm n. 5 (3) μm φ Saitama, 1999

Rosculus sp. ? 30 x 18 μm n. μm φ Onnenai Kushiro marsh Hokkaido, 2005

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