Diagnosis
provided by World Register of Marine Species
Test low trochospiral, planoconvex with convex and semi-involute spiral side, chambers increasing rapidly in breadth but more slowly in height, umbilical side involute and flat to concave, sutures depressed, strongly curved, arching forward to the midpoint, then curving back toward the truncate periphery; wall calcareous, perforate, hyaline, thin, umbilical surface distinctly pustulose; aperture not described. Holocene; at 20 m, off California, San Miguel Island. (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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