Diagnosis
provided by World Register of Marine Species
Test free, elongate, early stage lenticular to subglobular, chambers biserially arranged, with the plane of biseriality in the early stage enrolled as in Cassidulina, some shallow water individuals enrolled throughout growth, whereas individuals in deeper water have uncoiled later stage and more elongate chambers; wall calcareous, optically granular, perforate, surface smooth; aperture subterminal, oval to an elongate loop bordered by a narrow lip, with a small spatulate tooth arising from the base of the face adjacent to the previous chamber and protruding from the aperture. U. Eocene 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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