Diagnosis
provided by World Register of Marine Species
Test ovate to subtriangular in outline, lenticular in section, periphery carinate, chambers moderately inflated, biserially arranged1 increasing in proportionate breadth as added: sutures straight to oblique, depressed; wall calcareous, finely perforate, thin, hyaline, optically radial, surface smooth to longitudinally costate, with short, fine ribs, peripheral keel may be entire or may be interrupted at each suture and have a serrate margin; aperture basal to areal, large and oval, with a thick bordering lip and an internal folded or U-shaped toothplate, attached part broad and triangular, free part narrow, one angle showing through the aperture as a short tooth. Holocene; Pacific; Atlantic. (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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