Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 310, Figs. 4-5: M.-U. Triassic, China. 4, Axial section of holotype, x 200; 5, equatorial section, x 200 (from He, 1959). courtesy of Michael Hesemann https://foraminifera.eu
