Alterbidinium circulum

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.

Parent: Alterbidinium