Pentadinium circumsutum
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?circumsutum (Morgenroth, 1966b, p.5, pl.1, figs.3-4) Stover and Evitt, 1978, p.180. Holotype: Morgenroth, 1966b, pl.1, fig.3. Originally Pterodinium, subsequently (and now) Pentadinium?. Questionable assignment: Stover and Evitt (1978, p.180). Age: Early Oligocene.
Parent: Pentadinium