Palaeoperidinium ellipsoideum

"?ellipsoideum" Deflandre, 1936b, p.178, pl.6, figs.5-7.  Holotype: Deflandre, 1936b, pl.6, figs.6-7.  Name not validly published: generic name not validly published until 1967.  NOW Microdinium?.  Originally Palaeoperidinium (name not validly published), subsequently (and now) Microdinium?, thirdly Microdinium, fourthly Palaeoperidinium? (combination not validly published).  Questionable assignment: Stover and Evitt (1978, p.218) as a problematic species.  This combination was not validly published in Stover and Evitt (1978, p.218) since these authors did not fully reference the basionym.  Age: Senonian.

Parent: Palaeoperidinium