Diagnosis
provided by World Register of Marine Species
Test oval in outline, compressed and planoconvex, bievolute, low trochospiral coil of about two rapidly expanding whorls, spiral side convex, umbilical side flat to concave, chambers semilunate, four in the last whorl, each with a small umbilical flap on the umbilical side, sutures curved, thickened, periphery carinate; wall calcareous, hyaline, finely perforate except for the imperforate keel and limbate sutures, surface smooth; aperture low, apparently beneath the umbilical flaps. Holocene, at 1,700 m to 2,300 m; Pacific, off Bikini. (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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