Hystrichosphaeridium nudatum

"nudatum" Timofeev, 1959, p.53, pl.4, fig.10. Holotype: Timofeev, 1959, pl.4, fig.10. NOW Baltisphaeridium (Appendix A). Originally Hystrichosphaeridium, subsequently (and now) Baltisphaeridium (Appendix A). Age: Early Ordovician.