Diagnosis
provided by World Register of Marine Species
Test coiled, planispiral, umbilicate, with chambers increasing rapidly in height; wall proteinaceous and flexible, hence test commonly is somewhat flattened, smooth, and translucent; aperture equatorial, areal, a single arched opening or two symmetrical openings low in the apertural face, surrounded by a raised margin. Holocene, brackish estuary; Malaysia. (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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