Alterbidinium circulum
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circulum (Heilmann-Clausen, 1985, p.16-17, pl.1, figs.1-8; text-fig.5) Lentin and Williams, 1989, p.13. Holotype: Heilmann-Clausen, 1985, pl.1, figs.1-2. Originally Alterbia (generic name illegitimate), subsequently (and now) Alterbidinium. Age: Early Paleocene.