Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 21, Fig. 6: Silurian, Osgood Limestone, Missouri, USA. Holotype, x 27 (from Dunn, 1942). courtesy of Michael Hesemann https://foraminifera.eu
