Hystrichosphaeridium cognitum
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"cognitum" Timofeev, 1959, p.54–55, pl.4, fig.15. Holotype: Timofeev, 1959, pl.4, fig.15. NOW Baltisphaeridium (Appendix A). Originally Hystrichosphaeridium, subsequently (and now) Baltisphaeridium (Appendix A). Age: Early-Mid Ordovician.
Parent: Hystrichosphaeridium