Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 384, Figs. 3-6: U. Cretaceous (Campanian), Dordogne, France. 3, Structural diagram, x 70; 4, 5, nearly axial oblique section, entire specimen, x 10, and part enlarged, x 40; 6, tangential section showing preseptal canal, x 40 (from Reichel, 1937). courtesy of Michael Hesemann https://foraminifera.eu