Diagnosis
provided by World Register of Marine Species
Test attached by a prominent basal disc, chambers closely coiled and trochospiral in the early stage, later more loosely coiled and high spired, growing upright around a solid central column, chambers somewhat produced, septa simple, imperforate, sutures oblique, depressed; wall calcareous with organic inner lining, thick, optically radial, outer walls coarsely perforate but area just above the aperture imperforate, surface smooth; aperture a low and narrow interiomarginal and umbilical slit and may be bordered by a distinct lip. Miocene to Holocene; cosmopolitan. (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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