Zygodiscus Bramlette & Sullivan, 1961
Bramlette, M. N. & Sullivan, F. R., (1961): Coccolithophorids and related nannoplankton of the Early Tertiary in California. - Micropaleontology. 7(2): 129-188.
Hay, W. W. & Mohler, H. P., (1967): Calcareous nannoplankton from Early Tertiary rocks at Point Labau, France and Paleocene-Early Eocene correlations. - Journal of Paleontology. 41(6): 1505-1541.