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