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. Originally Deflandrea, subsequently (and now) Spongodinium?, thirdly Isabelidinium?. Questionable assignment: Lentin and Williams (1976, p.40). Williams et al. (2017) retained this species questionably in Spongodinium. Age: Albian–Cenomanian.
Parent: Spongodinium