Hystrichosphaeridium bimarginatum

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"bimarginatum" Timofeev, 1959, p.54, pl.4, fig.12.  Holotype: Timofeev, 1959, pl.4, fig.12.  NOW Baltisphaeridium (Appendix A).  Originally Hystrichosphaeridium, subsequently (and now) Baltisphaeridium (Appendix A).  Age: Early Ordovician.

Parent: Hystrichosphaeridium