Diagnosis
provided by World Register of Marine Species
Test trochospirally enrolled; primary aperture extraumbilical-umbilical, bordered by a lip, advanced taxa with secondary sutural apertures on the umbilical side of the test. L. Cretaceous (Hauterivian) to U. Cretaceous (Maastrichtian). (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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