Diagnosis
provided by World Register of Marine Species
Test unilocular, ovate to pyriform, circular in section, with elongate neck; wall calcareous, perforate, optically radial, of two layers separated by numerous solid pillars perpendicular to the wall, inner wall layer entire, although it may have elongate tubercles at the innermost surface, outer layer ranging from one perforated with large teardroplike openings in diagonal alignment to a coarsely perforate or spongy structure; aperture terminal, rounded, on a neck that arises from the inner wall and continues as an elongate external tube, may flare terminally or have a cylindrical collar, internally with a short straight entosolenian tube. Pleistocene to Holocene; Mediterranean, Atlantic; Pacific. (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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