Diagnosis
provided by World Register of Marine Species
Test with chambers biserially arranged, the plane of biseriality planispirally enrolled in the early part, then uncoiling as in Cassidulinoides but with test compressed perpendicular to the plane of biseriality as in Ehrenbergina, sutures strongly oblique, curved, slightly depressed; wall calcareous, optically radial, commonly with lateral spines and flangelike carinae that are most prominent in the early stage, later chambers nearly smooth, apertural face may have grooves radiating from the aperture; aperture a large curved opening, with broad apertural flap protruding from the inner margin of the opening, against the previous chamber. Holocene, deep water, at 3,000 m to 4,500 m; N. and S. Pacific. (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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