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: Middle Ordovician.

Parent: Hystrichosphaeridium