Hystrichosphaeridium rjabininii
From dinoflaj3
"rjabininii" Timofeev, 1959, p.56, pl.4, fig.24. Holotype: Timofeev, 1959, pl.4, fig.24. NOW Baltisphaeridium (Appendix A). Originally Hystrichosphaeridium, subsequently (and now) Baltisphaeridium (Appendix A). Age: Early Ordovician.
Parent: Hystrichosphaeridium