Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 127, Figs. 10-13: U. Oligocene, Brasso Formation, Central Range, Trinidad. 10, 11, Side and apertural views; 12, longitudinal section; 13, side view; all x 34 (from Loeblich and Tappan, 1964).