Archiacina armorica (d'Archiac, 1868)

Descrission:

 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). courtesy of Michael Hesemann https://foraminifera.eu