Hystrichosphaeridium spinescens
From dinoflaj2
"spinescens" Timofeev, 1959, p.56, pl.4, fig.23. Holotype: Timofeev, 1959, pl.4, fig.23. NOW Baltisphaeridium (Appendix A). Originally Hystrichosphaeridium, subsequently (and now) Baltisphaeridium (Appendix A). Age: Early Ordovician.
Parent: Hystrichosphaeridium