Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 246, Figs. 15-17: L. Carboniferous (Tournaisian), Okayama Prefecture, Japan. 15, Equatorial section, x 100; 16, axial section, x 100; 17, equatorial section of holotype, x 100 (from Okimura, 1958). courtesy of Michael Hesemann https://foraminifera.eu