Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 445, Figs. 16-18: U. Cretaceous, L. Taylor Group, Travis County, Texas, USA. 16, Small specimen showing some of the early biserial chambers surrounding the early chambers, x 41; 17, 18, edge and side views, x 41 (from Loeblich and Tappan, 1964).
