Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 461, Figs. 9-10: 9, L. Cretaceous (Albian), Duck Creek Formation, Horseshoe Bend of Red River, Love County, Oklahoma, USA; 10, U. Cretaceous (Cenomanian), Grayson Formation, Denton County, Texas. 9, Side view of holotype, x 75; 10, hypotype, x 75 (9, from Loeblich and Tappan, 1964).
