Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 272, Figs. 15-17: U. Carboniferous (Bashkirian), Tyan-Shan. 15, Axial section of holotype, x 25; 16, 17, axial sections of paratypes, x 25 (from Ektova, 1977).
