Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 360, Figs. 7-11: U. Miocene (L. Sarmatian). Poland; 7, 8, opposite sides of hypotype, x 68; 9-11, apertural opening, side view, and top view of specimen with initial part preserved but first rectilinear chamber broken, x 68 (from Luczkowska, 1974). courtesy of Michael Hesemann https://foraminifera.eu
