Operculodinium tiara

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tiara (Klumpp, 1953, p.390–391, pl.17, figs.8–10) Stover and Evitt, 1978, p.179.  Holotype: Klumpp, 1953, pl.17, figs.8–9.  Originally Hystrichosphaeridium, subsequently Baltisphaeridium (Appendix A), thirdly Cordosphaeridium, fourthly Cleistosphaeridium, fifthly (and now) Operculodinium.  N.I.A.  Age: Eocene.

Parent: Operculodinium