Diagnosis
provided by World Register of Marine Species
Test elongate, robust, lituoline in form, periphery rounded, chambers biserially arranged, with plane of biseriality planispirally coiled in the early stage, and later biserial chambers with plane uncoiling, chambers with small triangular overlap onto the opposite side at the periphery, sutures slightly depressed; wall calcareous, optically radial, perforate; aperture in the adult subterminal and loop shaped to terminal and ovate, with small folded toothplate. Pleistocene to Holocene. (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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