From editor or global species database
Diagnosis Test planispiral, involute, umbilici closed, few inflated chambers per whorl, each with a large rhomboidal to subtriangular plate extending from the lateral ends of the aperture across the umbilical margin of the chamber to attach to the posterior border, covering the umbilical region and inner part of the intercameral suture and opening along the oblique peripherally facing margin, sutures depressed, periphery rounded, peripheral outline lobulate; wall calcareous, hyaline, optically granular, finely perforate, surface smooth; aperture interiomarginal and equatorial, a low slit extending laterally to the umbilici. M. Eocene to Holocene; cosmopolitan. (Loeblich & Tappan, 1987, Foraminiferal Genera and Their Classification) [details]
From editor or global species database