Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 140, Figs. 22-25: U. Triassic (Rhaetian), Plackleswiese, Austria. Oblique side, apertural, basal, and lateral views of holotype, x 33 (from Kristan, 1957).
