Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 459, Figs. 3-4: U. Pliocene, Okuwa, Kaga Prov., Japan. Opposite sides of paratype, x 42 (from Loeblich and Tappan, 1964).
