Diagnosis
provided by World Register of Marine Species
Test uniserial and rectilinear, globular proloculus followed by an elongate series of gradually enlarging and distally tapering flaskshaped chambers with blunt lower margin; wall very thin, delicate, and flexible, consisting of a single layer of minute quartz and mica grains agglutinated on a proteinaceous base, early stage may have foreign particles widely spaced, later with adjacent grains abutting; aperture a simple terminal opening, may be flush with the surface or slightly produced with a phialine neck, and may have more than one layer of grains immediately around the opening. Holocene; N. Atlantic: England at20m to46m; Norway from 150m to200m; Sweden from 20 m to 515 m. (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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