Discolithus planus Bramlette & Sullivan, 1961
Discolithus inconspicuus Sullivan, 1964
Pontosphaera inconspicua (Sullivan 1964) Perch-Nielsen, 1984
Bramlette, M. N. & Sullivan, F. R. 1961, Coccolithophorids and related nannoplankton of the Early Tertiary in California. Micropaleontology 7(2): 129-188.
Haq, B. U. 1971. Paleogene calcareous nannoflora. Parts I-IV. Stockholm Contributions in Geology 25: 1-158.
Perch-Nielsen, K. 1984. Validation of new combinations. INA Newsletter. 6(1): 42-46.
Sullivan, F. R., 1964. Lower Tertiary nannoplankton from the California Coast Ranges. I. Paleocene. University of California Publications in Geological Sciences 44, 163-227.