Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 227, Figs. 5-6: U. Devonian (Frasnian). Pechora Oblast, Russia. 5, Paratype. x 70; 6, holotype x 70 (from Varsanof'eva and Reyllinger. 1962). courtesy of Michael Hesemann https://foraminifera.eu
