Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 218, Figs. 1-4: L. Carboniferous (Visean). 1-3, Northumberland, England, side, edge, and basal view of neotype (BMNH P40403), x 84 (from Loeblich and Tappan, 1964, Treatise on lnvertebrate Paleontology); 4, U. Visean, France, axial section, x 89 (from Mamet, 1969).
