Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 364, Figs. 9-10, 12: U. Cretaceous (Santonian), Lerida Province, Spain. 9, part of test enlarged to show trematophore, x 15; 10, 12, axial and horizontal sections, enlarged (9, 10, 12, from Munier-Chalmas and Schlumberger, 1885). courtesy of Michael Hesemann https://foraminifera.eu
