Diagnosis
provided by World Register of Marine Species
Test nautiloid in the early stage, numerous low chambers in a close flat trochospiral or planispiral coil, later uncoiling, laterally compressed and flaring, with chambers progressively broader and more arched although increasing very little in height, interior of chambers undivided, sutures depressed; wall calcareous, porcelaneous, that of earliest chambers perforate, surface of the adult smooth and unornamented other than having very fine pseudopores; aperture in the early coil may consist of a row of pores near the base of the apertural face, becoming centrally arched as the chambers increase in size, then with two rows of pores up the apertural face, and in the final uncoiled stage may have two offset rows of pores or a single row. Miocene to Holocene; cosmopolitan. (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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