Diagnosis
provided by World Register of Marine Species
Test trochospiral, planoconvex to biconvex with strongly elevated spiral side, periphery carinate, sutures curved and oblique on the spiral side, nearly radial on the umbilical side, meeting in the umbilical region at a clear calcite boss but with final few chambers tending to flare and failing to reach the center, resulting in a depressed umbilical region or pseudoumbilicus that may be partially closed by a small umbilical flap from each chamber; wall calcareous, perforate, surface smooth; primary aperture interiomarginal, extending from the umbilicus to the peripheral keel and bordered above by a narrow lip, supplementary rounded areal pores scattered over the apertural face. Pliocene to Holocene; 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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