Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 447, Figs. 5-8: U. Jurassic (L. Volgian), Tyumensk District, W. Siberia, Russia. 5-7, Side, edge, and top views of holotype, x 40; 8, side view of paratype, x 40 (from Putrya, 1972).
