Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 140, Figs. 13-15: L. Cretaceous (Aptian), Azerbaijan Side, edge, and apertural view of holotype, x 80 (from Tairov, 1956). courtesy of Michael Hesemann https://foraminifera.eu
