Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 326, Figs. 9-12: M. Triassic (Ladinian), Bulgaria. 9-11, Side views of paratypes, x 55; 12, holotype, x 55 (from Trifonova, 1977). courtesy of Michael Hesemann https://foraminifera.eu
