Perouvianella peruviana (Steinmann, 1930)

Description:

 Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification.  Van Nostrand, Reinhold Co. New York 1728 pp. Plate 402, Figs. 1-4: U. Cretaceous (Santonian), Huanuco Viejo Aguamiro, Peru. 1, Subaxial transverse section of microspheric topotype cut parallel to the septum, at the left showing radial pillars that attach at the base but are detached above, at right intersecting septum with three rows of apertures, x 40; 2, subequatorial section of paratype, cutting radial and interseptal pillars, x 20; 3, lateral view of microspheric lectotype showing spiralling chambers, x 5; 4, equatorial section showing interseptal pillars narrow at the midpoint, wider and fusing at their base, x 100 (from G. Bizon et al., 1975). courtesy of Michael Hesemann https://foraminifera.eu