De Verteuil and Norris, 1992
From dinoflaj3
de Verteuil, L. and Norris, G., 1992: Miocene protoperidiniacean dinoflagellate cysts from the Maryland and Virginia coastal plain. In: Head, M.J. and Wrenn, J.H. (editors), Neogene and Quaternary dinoflagellate cysts and acritarchs, p.391-430, pl.1-12; American Association of Stratigraphic Palynologists Foundation, Dallas, U.S.A.