Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 120, Figs. 17-18: Oligocene, Alazan Shale, Vera Cruz, Mexico. Side and top views of topotype showing row of apertural pores in the terminal groove, x 42 (from Loeblich and Tappan, 1964).
