Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 261, Figs. 12-14: U. Carboniferous (Moscovian), China. 12, 14, Huanglung Limestone, Shimanshan; 13, Anshan, Hohsien, Anhui. 12, Sagittal section of paratype, x 30; 13, axial section of paratype, x 20; 14, axial section of holotype, x 30 (from Thompson, 1948). courtesy of Michael Hesemann https://foraminifera.eu