Diagnosis
provided by World Register of Marine Species
Test attached, proloculus followed by tubular chamber that may be nearly straight, or with early coil followed by uncoiled and straight tubular chamber, or by a zigzag or irregularly growing tubular chamber. U. Devonian (Frasnian) 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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