Description Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 390, Figs. 4, 5: M. Oligocene, Bretagne, France. 3, Spiral face, x 16; 4, 5, exterior of partly decorticated topotypes, x 37; 6, edge view showing natural axial half-section, x 16 (from Loeblich and Tappan, 1964).