Hystrichokolpoma biformoides
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"biformoides" (Eisenack, 1954b, p.68, pl.11, figs.16–20) Rozen, 1965, p.308. Holotype: Eisenack, 1954b, pl.11, fig.18. NOW Achilleodinium. Originally Hystrichosphaeridium, subsequently Baltisphaeridium (Appendix A), thirdly Hystrichokolpoma, fourthly (and now) Achilleodinium, fifthly Florentinia. Morgenroth (1966a, p.28) also proposed this combination. Age: late Eocene–early Oligocene.
Parent: Hystrichokolpoma