Description Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 228, Figs. 9-10: L. Carboniferous (Visean), Russia. Type species of Cribrostamum von Möller. Side view and longitudinal section, x 22 (from von Möller, 1879).