Diagnosis
provided by World Register of Marine Species
Test auriculate in outline, trochospiral, about two and a half rapidly expanding whorls with eleven chambers in the final whorl, spiral side evolute, umbilical side partly evolute, sutures gently curved, limbate on the spiral side, periphery rounded; wall calcareous, hyaline, spiral side distinctly perforate, umbilical side more finely perforate, apertural face, septa, and thickened sutures of the spiral side nonperforate, umbilical side granulate or pustulose centrally, with a few radial grooves around the umbilicus; aperture a low slit at the base of the last chamber on the umbilical side. Holocene, at 160 m; Galapagos: Albemarle Island (Isabella). (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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