Hystrichosphaeridium bahiaense Regali et al., 1974

NOW Operculodinium. Originally Hystrichosphaeridium, subsequently Cleistosphaeridium?, thirdly Impletosphaeridium?, fourthly (and now) Operculodinium.

Holotype: Regali et al., 1974, pl.23, fig.5
Age: EoceneOligocene