Diagnosis
provided by World Register of Marine Species
Test planoconvex or inequally biconvex, trochospiral, coiling dextral, chambers enlarging rapidly and becoming progressively broader and lower, final chamber strongly overlapping and comprising about one-half the area on the deeply umbilicate umbilical side, internal partition present as in Ceratobulimina but where it attaches to the septal face the toothplate bends sharply to form a triangular structure, sutures radial, periphery subacute to carinate; wall calcareous, aragonitic, finely perforate, surface smooth and polished on the umbilical side, may be pustulose on the spiral side; aperture interiomarginal, umbilical, closed by a thin plate as the next chamber is added, and a septal foramen is formed by resorption. U. Cretaceous (Turonian) 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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