Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 393, Figs. 5-8: U. Cretaceous (Maastrichtian), Cuba. 5, Horizontal section of megalospheric test, x 25; 6, side view, x 22; 7, apertural view, x 24; 8, axial section, x 45 (from Seiglie, 1961). courtesy of Michael Hesemann https://foraminifera.eu
