Diagnosis
provided by World Register of Marine Species
Test attached, planoconvex, trochospiral, all chambers visible on the flat spiral side and sutures flush and strongly oblique, only the six to seven chambers of the final whorl visible on the strongly convex umbilical side where sutures are straight and nearly radial around the narrow and deep umbilicus, periphery carinate and may spread somewhat against the attachment; wall calcareous, umbilical side distinctly perforate, keel and a small area around the umbilicus not perforate, in older specimens umbilicus may be surrounded by thickened shell material; slitlike interiomarginal aperture extending from the periphery to the umbilicus. U. Eocene to Holocene; tropical cosmopolitan. (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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