Isabelidinium belfastense
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"belfastense" (Cookson and Eisenack, 1961a, p.71, pl.11, figs.4–6) Lentin and Williams, 1977a, p.167. Holotype: Cookson and Eisenack, 1961a, pl.11, fig.4; Helby et al., 1987, fig.41D. Taxonomic senior synonym: Deflandrea (now Isabelidinium) cooksoniae according to Fensome et al. (2009, p.39). Originally Deflandrea, subsequently Isabelia (combination illegitimate), thirdly Isabelidinium. Age: Late Cretaceous.