Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 48, Figs. 11-16: L. Cretaceous, Southern Emba river, Koschagyl, Kazakhstan. 11-15, U. Aptian; 11-13, paratypes, x 72; 14, 15, holotype, x 72; 16, M. Albian, specimen in glycerine to show early coils, x 72 (from Myatlyuk, 1971). courtesy of Michael Hesemann https://foraminifera.eu