Hystrichosphaeridium biformoides
From dinoflaj2
"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