Hystrichosphaeridium monacanthum
From dinoflaj2
"monacanthum" Deunff, 1951, p.323; text-fig.4. Holotype: Deunff, 1951, text-fig.4. NOW Deunffia (Appendix A). Originally Hystrichosphaeridium, subsequently Veryhachium? (combination not validly published; Appendix A), thirdly (and now) Deunffia (Appendix A). Age: Mid Ordovician.
Parent: Hystrichosphaeridium
