Hystrichosphaeridium biformoides

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"biformoides" Eisenack, 1954b, p.68, pl.11, figs.16-20.  Holotype: Eisenack, 1954b, pl.11, fig.18.  NOW Achilleodinium.  Originally Hystrichosphaeridium, subsequently Baltisphaeridium (Appendix A), thirdly Hystrichokolpoma, fourthly (and now) Achilleodinium, fifthly Florentinia.  Age: Late Eocene-Early Oligocene.

Parent: Hystrichosphaeridium