Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 466, Figs. 10-11: Pleistocene, Northeast Atlantic. 10, Side view of holotype, SEM, x 97; 11, broken paratype showing entosolenian tube, SEM, x 92 (from R. W. Jones, 1984).