Diagnosis
provided by World Register of Marine Species
Test elongate ovate in outline, ovate in section, trochospirally enrolled, with chambers increasing rapidly in breadth but slowly in height, extending far back proximally on the inside of the coil so that the spiral side has an astacoline appearance but final chamber reaches nearly to the proloculus on the umbilical side, thus is opposed to all earlier chambers along the elongate umbilical groove, periphery rounded to subangular at the margins; wall calcareous, hyaline, finely perforate, surface smooth; aperture an interiomarginal and umbilical loop, bordered by a few straight and radiating grooves that extend to the peripheral margin of the flattened apertural face. Holocene; Mexico; USA: off California, San Clemente, Santa Rosa, and Catalina Islands. (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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