Diagnosis
provided by World Register of Marine Species
Test ovate in outline, slightly compressed and lenticular in section, narrow and elongate chambers added in sigmoid series, successive chambers extending to the test base and overlapping previous chambers on one side of the test, sutures curved, flush to slightly depressed; wall calcareous, perforate, radial, surface smooth; aperture terminal, radiate. M. Eocene to Holocene; Japan; Australia: Victoria; New Zealand; Formosa; Indonesia; Sumatra; Philippines; USA: California, Texas, South Carolina; West Indies: Trinidad. (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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