Borodinia septentrionalis Hanzawa, 1940

Description:

Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification.  Van Nostrand, Reinhold Co. New York 1728 pp. Plate 660, Figs. 1-2: L. Miocene (Aquitanian), subsurface, Daito Islands (Kitadaitojima, formerly North Borodino Island), E. of Ryukyu lslands, W. Pacific. 1, Transverse section showing thickened outer wall of separate layers, x 20; 2, tangential section intersecting outer wall at upper left, x 20 (from Hanzawa, 1940).