Hystrichosphaeridium tiara

"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