Diagnosis
provided by World Register of Marine Species
Test auriculate in outline, planoconvex, low trochospiral coil with about one and a half rapidly enlarging whorls, bievolute so that all chambers are visible on both sides, spiral side weakly convex, sutures curved and strongly oblique, umbilical side flat with chambers wedgelike and sutures radial, periphery angular, carinate; wall calcareous, hyaline, appearing to be thickened just beneath the septal face, but this is interpreted as the internal attachment to the wall on the spiral side of a toothplate that extends across the terminal face and along the peripheral wall about halfway to the previous septum and extends from the lower margin of the septal face to attach like a septal flap to the previous septum; aperture interiomarginal on the umbilical side, extending from the periphery to the umbilicus and appearing to continue around the spiral suture. Holocene, between 1,720 m and 2,300 m; Pacific, off Bikini Island. (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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