De Schepper and Head, 2008
From dinoflaj3
De Schepper, S. and Head, M.J., 2008: New dinoflagellate cyst and acritarch taxa from the Pliocene and Pleistocene of the eastern North Atlantic (DSDP Site 610). Journal of Systematic Palaeontology, v.6, no.1, p.101-117, pl.1-6.