Alveolophragmium orbiculatum Shchedrina, 1936

Description:

 Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification.  Van Nostrand, Reinhold Co. New York 1728 pp. Plate 97, Figs. 5-7: Holocene, Sea of Japan. 5, 6, Side and edge views, x 12; 7, horizontal section showing alveolar interior, x 25 (from Rauzer-Chernousova and Fursenko, 1959). courtesy of Michael Hesemann https://foraminifera.eu