Diagnosis
provided by World Register of Marine Species
Test uniserial and rectilinear, may be up to 10 mm in length, chambers somewhat pyriform, with successive chambers overlapping previous ones so that sutures are obscure externally and the test is nearly cylindrical; wall thick, agglutinated of more than a single layer of fine quartz grains and tests of small foraminifers, may be only partially cemented, thickest where the new chamber overlaps that preceding, with an inner proteinaceous lining; aperture terminal, central, round. Holocene; N. Atlantic from 100 m to 4,066 m; Indian Ocean at 3,140 m. (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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