Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 256, Figs. 7-9: Ural Mountains; 7, tangential axial section, x 80; 8, sagittal section, x 80; 9, axial section, x 80 (from Malakhova, 1975). courtesy of Michael Hesemann https://foraminifera.eu
