Coccolithus biparteoperculatus (Varol, 1991) Bown & Dunkley Jones, 2012
Coccolithus cachaoi Bown, 2005
Bown, P. R., (2005): Palaeogene calcareous nannofossils from the Kilwa and Lindi areas of coastal Tanzania (Tanzania Drilling Project 2003-4). - Journal of Nannoplankton Research. 27(1): 21-95.
Bown, P. R. & Dunkley Jones, T., (2012): Calcareous nannofossils from the Paleogene equatorial Pacific (IODP Expedition 320 Sites U1331-1334). - Journal of Nannoplankton Research. 32(2): 3-51.
Varol, O., (1991): New Cretaceous and Tertiary Calcareous Nannofossils. - Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen. 182: 211-237.
Birkelundia biparteoperculata
Varol, 1991
Late Eocene
DSDP Leg 40, Site 363, Valvis Ridge, South Atlantic