Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 302, Fig. 1: . M. Permian (U. Qixian), Chihsia Limestone, Chienkiang, Kwangsi Province, China. Slightly diagonal axial section of holotype, x 15 (from J. S. Lee, 1934). courtesy of Michael Hesemann https://foraminifera.eu