Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 433, Figs. 3-4: L. Jurassic (U. Pliensbachian), Sweden. 3, Side view, x 177; 4, oblique apertural view, x 173 (from Norling, 1972). courtesy of Michael Hesemann https://foraminifera.eu