Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 255, Figs. 6-7: U. Permian (Murgabian), Turkey, 6, axial section of holotype, x 70; 7, slightly oblique sagittal section, x 70 (from Erk, 1942). courtesy of Michael Hesemann https://foraminifera.eu
Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 255, Fig. 5: U. Permian. 5, U. Permian, Nikitinsk horizon, N. Caucasus, slightly tangential axial section, x 47 (from K. V. Miklukho-Maklay, 1954). courtesy of Michael Hesemann https://foraminifera.eu
