Palaeocystodinium hyperxanthum

?hyperxanthum (Vozzhennikova, 1963, p.185, fig.20) Vozzhennikova, 1967, p.152.  Emendation: Lentin and Vozzhennikova, 1990, p.60, as Palaeocystodinium? hyperxanthum.  Holotype: Vozzhennikova, 1963, fig.20, lost according to Lentin and Vozzhennikova (1990, p.60).  Lectotype: Lentin and Vozzhennikova, 1990, pl.7, fig.7; text-fig.31, designated by Lentin and Vozzhennikova (1990, p.60).  Originally Cystodiniopsis, subsequently Palaeocystodinium, thirdly (and now) Palaeocystodinium?.  Questionable assignment: Stover and Evitt (1978, p.115).  Age: Paleocene.

Parent: Palaeocystodinium