Helicopontosphaera papillata Bukry & Bramlette, 1969
Bukry, D. & Bramlette, M. N., (1969): Some new and stratigraphically useful calcareous nannofossils of the Cenozoic. - Tulane Studies in Geology. 7: 131-142.
Jafar, S. A. & Martini, E., (1975): On the validity of the calcareous nannoplankton genus Helicosphaera. - Senckenbergiana Lethaea. 56: 381-397.
Helicopontosphaera papillata
Bukry & Bramlette, 1969
Middle Eocene