Cretarhabdus Bramlette & Martini, 1964
Bramlette, M. N. & Martini, E., (1964): The great change in calcareous nannoplankton fossils between the Maastrichtian and Danian. - Micropaleontology. 10(2): 291-322.
Thierstein, H. R., (1973): Lower cretaceous calcareous nannoplankton biostratigraphy. - Abhandlungen der Geologischen Bundesanstalt. 29: 3-52.