Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 147, Figs. 4-8: U. Cretaceous (Senonian). 4-6, France, opposite sides and apertural view (P. Marie Collection No. 6051, Paris), x 39; 7, 8, England, edge and apertural views of young individual, x 50.
