Diagnosis
provided by World Register of Marine Species
Test ovate to auriculate in outline, spiral side weakly convex, umbilical side flat to concave, low trochospiral coil of one to one and a half whorls of rapidly enlarging chambers, four to four and a half chambers in the final whorl, an umbilical flap projecting from the margin of each chamber into the open umbilicus, curved and nearly flush sutures may grade imperceptably into the peripheral keel; wall calcareous, hyaline, translucent, distinctly perforate but with imperforate carina; aperture in a small looplike reentrant of the umbilical margin of the final chamber, those of earlier chambers remaining open into the umbilicus. Holocene; Mexico: Guadalupe Island, Fraile Bay, Gulf of California; USA: San Clemente Island, California. (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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