Diagnosis
provided by World Register of Marine Species
Test ovate in outline, low trochospiral and planoconvex, flattened side showing all chambers of the one to one and a half whorls, sutures curved and flush, convex side involute, showing only the two to three and a half rapidly enlarging semicircular chambers of the final whorl and the straight and flush sutures, periphery angular, with broad imperforate carinal band; wall calcareous, hyaline, distinctly perforate except for the peripheral band, surface smooth; aperture in a loop that extends from the umbilicus up the face of the final chamber on the flat side of the test, apparently bordered by a scroll-like pillar, those of earlier chambers also remaining open, the scrolls of the various apertures may be visible through the transparent test from the opposite side. Holocene, 20 m to 40 m; Philippines. (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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