Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 24, Figs. 12-14: U . Silurian (Ludlovian), Austria. Top, edge, and base of holotype, x 76 (from Kristan-Tollmann, 1971). courtesy of Michael Hesemann https://foraminifera.eu
