Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 352, Fig. 15: U. Eocene, New Zealand. Side view of holotype, x 35 (from Finlay, 1947). courtesy of Michael Hesemann https://foraminifera.eu
