Diagnosis
provided by World Register of Marine Species
Test of medium size, about 0.3 mm to 0.4 mm in diameter, in a low trochospiral coil, concavoconvex, about two and a half to three and a half whorls of rapidly enlarging inflated chambers, spiral side evolute, sutures curved, oblique and depressed, umbilical side concave, partially evolute, sutures nearly straight, slightly oblique, internal partition cuts off a small umbilical chamberlet, umbilicus with prominent central plug, periphery rounded; wall calcareous, thick, almost opaque, perforate, surface smooth; primary aperture interiomarginal, beneath the flaps on the umbilical side, and may remain open on earlier chambers of the final whorl, small triangular secondary sutural openings present at the junction of spiral and intercameral sutures on the spiral side and secondarily closed as later chambers are added, additional sutural openings present in a small reentrant in the radial sutures a short distance from the umbilicus on the umbilical side. Holocene; Philippine 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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