Diagnosis
provided by World Register of Marine Species
Test lenticular to flattened, ovate to palmate; distinctly coiled, at least in the early stage, later may be uncoiled; aperture at the peripheral angle in enrolled forms, terminal in the uncoiled part, radiate, slitlike or multiple. U. Triassic to Holocene. (Loeblich & Tappan, 1987, Foraminiferal Genera and Their Classification)
Loeblich, A. R.; Tappan, H. (1987). Foraminiferal Genera and their Classification. Van Nostrand Reinhold Company, New York. 970pp.
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