Type species: Toweius petalosus Ellis & Lohmann, 1973
Ellis, C. H. & Lohmann, W. H., (1973): Toweius petalosus new species, a Paleocene calcareous nannofossil from Alabama. - Tulane Studies in Geology and Paleontology. 10: 107-110.
Varol, O., (1989): Palaeocene calcareous nannofossil biostratigraphy. In, Crux, J. A. & van Heck, S. E. (eds) Nannofossils and their applications: Proceedings of the 2nd INA Conference, London 1987. - British Micropalaeontological Society Publication Series. 265-310.