Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 247, Figs. 15-17: L. Carboniferous (Visean), USSR. 15, Equatorial section, x 40 (from Rauzer-Chernousova, 1948); 16, 17, Carboniferous, Belogorod, Septsch Toula, USSR, side and apertural views (ex von Möller collection, USNM P3322), x 48 (from Loeblich and Tappan, 1964). courtesy of Michael Hesemann https://foraminifera.eu
