Diagnosis
provided by World Register of Marine Species
Test oval in outline, trochospiral with about two whorls of seven to eight chambers each, planoconvex to biconvex, spiral side more convex, periphery rounded, chambers increasing rapidly in breadth as added, becoming broad and low and curving back at the periphery, final chamber with a lobulate extension over the umbilical region, sutures flush, curved on the spiral side, radial on the umbilical side around the open umbilicus; wall calcareous, finely perforate, and with fine radiating striae on the umbilical side, each chamber with two or more radial rows of large pores on the spiral side; aperture not observed, possibly an interiomarginal slit at the anterior margin of the final chamber on the umbilical side. Holocene; eastern Pacific, off California. (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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