Diagnosis
provided by World Register of Marine Species
Test ovate in outline, flattened, with narrow elongate chambers one-half coil in length, at first added in a sigmoiline series that is elevated above the general level, later planispiral and evolute; wall calcareous, imperforate, thin, fragile and hyaline, surface of later chambers crenulated, with seven or eight gentle transverse undulations; aperture with two openings in a terminal trematophore. Holocene, from 20 m to 100 m; off Colombia; Mexico; Philippines. (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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