Spongodinium extremum
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"?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
