Diagnosis
provided by World Register of Marine Species
Test flattened, broad, and somewhat elongate, early chambers slightly trochospiral and involute, final chamber uncoiled and rectilinear; wall calcareous, imperforate, porcelaneous, surface with numerous closely spaced longitudinal costae; aperture terminal, a narrow elongate slit with smooth and thickened bordering lip, slightly turned toward the side with the umbilical view of the coil. Holocene; Atlantic; Pacific; Mediterranean. (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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