Diagnosis
provided by World Register of Marine Species
Test large, up to 2 mm in diameter, discoidal, auriculate in outline, laterally compressed, biumbilicate, periphery carinate, globular proloculus followed by a few rapidly enlarging planispiral whorls, about three chambers per whorl in the later stage, septa oblique, curved backward at the periphery; wall calcareous, imperforate, porcelaneous, thick, commonly obscuring the early whorls; aperture at the open end of the final chamber, a high subtriangular opening, with a height nearly equal to the test radius. 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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