Diagnosis
provided by World Register of Marine Species
Test planispiral but may tend to become trochospiral; aperture equatorial and interiomarginal with bordering lip, those of earlier chambers may partly remain open as relict apertures after new chambers are added. L. Cretaceous (Barremian) to U. Cretaceous (Maastrich tian). (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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