Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 306, Figs. 3-6: U. Permian (Murgabian), Bamian Limestone, Afghanistan. 3, Sagittal section, x 20; 4, part of sagittal section enlarged to show structure of wall and axial septula, x 100; 5, enlarged part of axial section to show structure of primary and secondary septula, x 100; 6, axial section of holotype, x 20 (from Thompson, 1946). courtesy of Michael Hesemann https://foraminifera.eu