Hystrichosphaeridium eisenackianum
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"eisenackianum" Deunff, 1959, p.23–24, pl.2, figs.26,30–31. Holotype: Deunff, 1959, pl.2, fig.26. NOW Baltisphaeridium (Appendix A). Originally Hystrichosphaeridium, subsequently (and now) Baltisphaeridium (Appendix A). Age: Middle Ordovician.
Parent: Hystrichosphaeridium
Infrataxon List: