Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 437, Figs. 6-7: U. Permian, Hydra Island, Greece. 6, Slightly oblique axial section of paratype, x 100; 7, nearly equatorial section of holotype tangential to proloculus, x 100 (from Reiehel, 1946).