Isabelidinium extremum
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?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. Originally Deflandrea, subsequently Spongodinium?, thirdly (and now) Isabelidinium?. Questionable assignment: Stover and Evitt (1978, p.109). Age: Albian-Cenomanian.
Parent: Isabelidinium
