Spongodinium extremum

"?extremum" (Cookson and Eisenack, 1974, p.48, pl.20, fig.4) Lentin and Williams, 1976, p.40.  Holotype: Cookson and Eisenack, 1974, pl.20, fig.4.  NOW Isabelidinium?.  Originally Deflandrea, subsequently Spongodinium?, thirdly (and now) Isabelidinium?.  Questionable assignment: Lentin and Williams (1976, p.40).  Age: Albian-Cenomanian.

Parent: Spongodinium