Diagnosis
provided by World Register of Marine Species
Test tiny, up to 0.16 mm in diameter, circular in outline, planoconvex, about two whorls visible on the convex spiral side, septa radial and weakly depressed, umbilical side involute, flat to concave, about five to six chambers in the final whorl visible around the open umbilicus, chambers with narrow triangular umbilical flap or folium resulting in a strongly sinuate suture, with distinct reentrant between the umbilical flap and the periphery, peripheral keel prominent; wall calcareous, hyaline, transparent, a few large circular pores bordered by a distinct lip present on the spiral side, ranging from two or three on the earlier chambers to as many as fifteen aligned in rows on later chambers, surface of the umbilical side granulose to pustulose, with prominent pustules at the umbilical margin of earlier chambers; primary aperture subequatorial on the spiral side, oval and bordered by a slight neck, accessory openings also present beneath the umbilical folia. Pleistocene to Holocene; N. Atlantic: off Ireland; S. Atlantic: Brazil; Caribbean: Venezuela. (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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