Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification. Van Nostrand, Reinhold Co. New York 1728 pp. Plate 453, Figs. 6-7: U. Cretaceous (Maastrichtian), Tharston, Norlolk, England. 6, Paratype showing free-Iiving Citharinella stage followed by the attached fistulose stage, x 25; 7, holotype (BMNH P40275) showing elongate attached stage and numerous apertures at the end of the fistulose extensions, x 15 (from Loeblich and Tappan, 1957).
