Diagnosis
provided by World Register of Marine Species
Test oval to elongate, periphery rounded, chambers inflated, biserially arranged and enrolled as in Cassidulina, sutures radial, flush to depressed; wall calcareous, optically granular, finely perforate, surface smooth and polished; aperture an arched narrow slit extending from the base of the final chamber, partially concealed by a large apertural plate from the lower rim. Oligocene to Holocene; Pacific. (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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