Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 119, Fig. 2: U. Cretaceous, [Cherneshchyna, Kharkiv region?], Ukraine. x 180 (from Macfadyen, 1933, after Yaklovev). courtesy of Michael Hesemann https://foraminifera.eu
