Operculodinium divergens
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divergens (Eisenack, 1954b, p.67, pl.9, figs.13–16) Stover and Evitt, 1978, p.178. Holotype: Eisenack, 1954b, pl.9, fig.14. Originally Hystrichosphaeridium, subsequently Baltisphaeridium (combination not validly published; Appendix A), thirdly Cordosphaeridium, fourthly (and now) Operculodinium. Age: early Oligocene.
