Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 141, Figs. 13-16: U. Cretaceous. 13-16, Atlantic deep sea cores, off W. Africa; 13, 14, Side and top views, x 100; 15, 16, top and edge views, x 100 (from Krasheninnikov and Pflaumann, 1978). courtesy of Michael Hesemann https://foraminifera.eu
