Diagnosis
provided by World Register of Marine Species
Test discoidal, very low trochospiral to nearly planispiral, semievolute on both sides, about two slowly enlarging whorls, eight to twelve chambers in the final whorl, umbilical margin of the chambers with a small umbilical flap or folium, sutures radial, slightly curved, limbate, elevated, the thickened sutures grading into the broad imperforate peripheral carina, periphery angular; wall calcareous, optically radial, finely perforate, surface smooth, except for the elevated imperforate septa and keel and occasional pustules in the umbilcal region; aperture a low equatorial and interiomarginal arch, bordered above by a narrow lip, a low slit continuing laterally beneath the folium in the umbilical region and around the spiral suture on both sides of the test, chamber lumen communicating with the exterior through a small rounded opening beneath the folium, apertures remaining open for a few chambers before being closed by lamellar thickening. Pleistocene to Holocene; Atlantic; Pacific; Mediterranean; Europe; USA. (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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