Description Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 404, Figs. 1-2: U. Cretaceous (Santonian), Burgos Province, Spain. 1, Equatorial section, x 15; 2, axial section, showing embryo and polar caps, x 47 (from Ciry, 1964).