Veryhachium monacanthum Appendix A

"?monacanthum" (Deunff, 1951, p.323; text-fig.4) Deunff, 1954b, p.305–307.  Holotype: Deunff, 1951, text-fig.4.  Combination not validly published: basionym not fully referenced and name not clearly used.  NOW Deunffia (Appendix A).  Originally Hystrichosphaeridium, subsequently Veryhachium (combination not validly published), thirdly (and now) Deunffia (Appendix A).  Questionable assignment: Deunff (1959, p.29).  This combination was also not validly published in Deunff (1959, p.29) and Cramer (1963, p.215), since these authors did not fully reference the basionym.  Age: Middle Ordovician.

Parent: Veryhachium_Appendix A