Diagnosis
provided by World Register of Marine Species
Test flattened, globular proloculus followed by planispirally enrolled and evolute undivided tubular second chamber as in Cornuspira, later whorls rapidly enlarging and finally uncoiling, flaring, branching, or spreading in the original plane of coiling; wall calcareous, porcelaneous, may have transverse growth wrinkles and may have longitudinal striae; aperture narrow, elongate, at the end of the flattened tubular branches. Holocene; N. Atlantic. (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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