Palaeoperidinium alatum

"?alatum" Conrad, 1941, p.5, pl.1, fig.C.  Holotype: Conrad, 1941, pl.1, fig.C.  Name not validly published: generic name not validly published until 1967.  NOW Microdinium?.  Originally Palaeoperidinium (name not validly published), subsequently (and now) Microdinium?, thirdly 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: Maastrichtian.

Parent: Palaeoperidinium