Diagnosis
provided by World Register of Marine Species
Test consisting of a streptospirally coiled tube, later uncoiled and rectilinear, with surrounding stack of ringlike chambers; wall porcelaneous, nonperforate in early whorls. U. Triassic (Norian). (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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