Frondovaginulina inversa (Reuss, 1844)

Description:

Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification.  Van Nostrand, Reinhold Co. New York 1728 pp. Plate 441, Figs. 9-11: U. Cretaceous. 9, L. Turonian, Bohemia, Czechoslovakia, 10, 11, Austin Chalk, Bell County, Texas. 9, Side view, showing early astacoline stage, x 17.5 (from Hercogova, 1985); 10, 11, side views of hypotypes, x 23 (from Cushman, 1946).