Hystrichosphaeridium annulatum
From dinoflaj2
"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
