Diagnosis
provided by World Register of Marine Species
Test flattened, lenticular in form, with distinct equatorial layer of somewhat larger chambers separating lateral layers of smaller closely packed chambers on either side lacking regular arrangement, those of successive layers not in alignment, sutures thickened, slightly elevated; wall calcareous, upper surface of the chambers coarsely perforate; aperture consisting of the coarse perforations. U. Eocene (Ludian) to Holocene; Australia; S. Pacific; Philippine Islands; Italy; Caribbean. (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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