Diagnosis
provided by World Register of Marine Species
Test free; chambers biserial or spiralling about a vertical axis, strongly overlapping, interior simple; aperture rounded or radiate. U. Triassic (Rhaetian) to Holocene. (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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