Sigmoilinella tortuosa Zheng, 1979

Descrição:

 Loeblich, A. R., Tappan, H. N., 1987: Foraminiferal genera and their classification.  Van Nostrand, Reinhold Co. New York 1728 pp. Plate 356, Figs. 5-7: Holocene, Nichujiao, Xisha Islands, China. 5, 6, Apertural and side views of holotype, x 65; 7, transverse section, x 130 (from S. Y. Zheng, 1979).