Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 408, Figs. 1-5: U. Cretaceous (Senonian), ltaly. 1, Horizontal section of microspheric test, x 16; 2, juvenile megalospheric test, x 24; 3, horizontal section of megalospheric test showing uncoiled later stage, x 24; 4, submedian section of microspheric test, x 24; 5, equatorial section of small megalospheric test, x 25 (from De Castro, 1971). courtesy of Michael Hesemann https://foraminifera.eu
