Isabelidinium extremum

"?extremum" (Cookson and Eisenack, 1974, p.48, pl.20, fig.4) Stover and Evitt, 1978, p.109.  Holotype: Cookson and Eisenack, 1974, pl.20, fig.4.  NOW Spongodinium?.  Originally Deflandrea, subsequently (and now) Spongodinium?, thirdly Isabelidinium?.  Questionable assignment: Stover and Evitt (1978, p.109).  Age: Albian–Cenomanian.

Parent: Isabelidinium