Diagnosis
provided by World Register of Marine Species
Test small, inflated, biconvex but central part of umbilical side excavated, trochospiral with about two and a half whorls, chambers enlarging rapidly, five per whorl, sutures depressed, curved back toward the periphery on the spiral side, nearly radial on the umbilical side, umbilicus closed, periphery rounded, outline lobulate; wall calcareous, distinctly perforate, surface smooth; aperture interiomarginal, extraumbilical to umbilical, bordered by a straight narrow lip, the slightly projecting lips of previous chambers remaining visible around the umbilical region. Holocene; Galapagos: Tower Island (Genovesa), at 350 m. (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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