Sphenolithus richteri Bown & Dunkley Jones, 2012
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.
Sphenolithus richteri
Bown & Dunkley Jones, 2012
Middle Eocene
IODP Expedition 320, Hole U1331A, Pacific Ocean