From editor or global species database
Diagnosis Test with strongly embracing chambers variously enrolled; aperture an arched slit just above the base of the chamber, giving the appearance of a flaplike tooth, or primary aperture may be absent in adult and replaced by a series of sutural supplementary openings. U. Cretaceous (Maastrichtian) to Holocene. (Loeblich & Tappan, 1987, Foraminiferal Genera and Their Classification) [details]