Diagnosis
provided by World Register of Marine Species
Test narrow, elongate, slightly compressed and ovate in section, early stage biserial, later with cuneate chambers and finally uniserial, chambers progressively higher as added, sutures oblique in the early stage, horizontal in the uniserial stage, slightly depressed; wall calcareous, perforate, hyaline, optically radial, surface ornamented with very fine longitudinal costae; aperture terminal in the adult, oval, with a narrow lip, provided with an internal subcylindrical toothplate that extends from the aperture to the previous foramen, those of successive chambers changing orientation by 180¡, one border being produced as a tooth. Eocene to Holocene; cosmopolitan. (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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