Hystrichosphaeridium rigens
From dinoflaj3
"rigens" Timofeev, 1959, p.55, pl.4, fig.18. Holotype: Timofeev, 1959, pl.4, fig.18. NOW Baltisphaeridium (Appendix A). Originally Hystrichosphaeridium, subsequently (and now) Baltisphaeridium (Appendix A). Age: Early Ordovician.
Parent: Hystrichosphaeridium