Hystrichosphaeridium monacanthum
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"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