Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 23, Fig. 9: Permian, Carnavon Basin, Western Australia. Side view, x 39 (from Crespin, 1958). courtesy of Michael Hesemann https://foraminifera.eu
