Microdinium ellipsoideum

?ellipsoideum Deflandre, 1936b, p.178, pl.6, figs.5–7 ex Sarjeant, 1967b, p.250.  Holotype: Deflandre, 1936b, pl.6, fig.6.  Originally Palaeoperidinium (name not validly published), subsequently Microdinium, thirdly (and now) Microdinium?, fourthly Palaeoperidinium?.  Lentin and Williams (1981, p.187) retained this species in Microdinium.  Questionable assignment: Lentin and Williams (1976, p.110).  The name Palaeoperidinium ellipsoideum was not validly published in Deflandre (1936b) since the generic name Palaeoperidinium was not validly published until 1967.  Williams et al. (1998, p.401) accepted Sarjeant's (1967b) indirect reference to Deflandre (1936b) as indication of a type (I.C.N. Article 40.3).  Lentin and Williams (1976, p.110) also proposed this name, as a new combination.  Age: Late Cretaceous.

Parent: Microdinium