Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 329, Figs. 4-6: Pleistocene (Timms Point Silt), California, USA. Opposite sides and edge view of hypotype (USNM Cushman Colt. 47040), x 124.