Description Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 283, Fig. 7: M. Permian (Kungurian), Guadalupian, Word Formation, Glass Mountains, Texas, USA. 7, Axial section of immature specimen, x 10 (from Dunbar and Skinner, 1937).