Hystrichosphaeridium annulatum

"annulatum" Timofeev, 1959, p.56, pl.4, fig.22.  Holotype: Timofeev, 1959, pl.4, fig.22.  NOW Baltisphaeridium (Appendix A).  Originally Hystrichosphaeridium, subsequently (and now) Baltisphaeridium (Appendix A).  Age: Early Ordovician.

Parent: Hystrichosphaeridium