Diagnosis
provided by World Register of Marine Species
Test rounded to ovate in outline, compressed, planispirally enrolled, each chamber approximately semicircular in side view, few rapidly enlarging chambers per whorl, ranging from three in the earliest whorl to five in the final one, inflated laterally so that test appears lobulate in edge view, slightly evolute, biumbilicate, sutures nearly straight, depressed, periphery carinate, final chamber uncoiled, with keel present both before and behind the terminal aperture; wall calcareous, hyaline, transparent, perforate radial, surface smooth; aperture multiple, of five or more rounded openings at the dorsal angle, each produced on a short tubular neck, openings of previous chambers marked by a clear triangular area at the periphery just preceding the new chamber. 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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