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