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Veryhachium monacanthum
Veryhachium? monacanthum (Deunff, 1951) Deunff, 1954
Combination not validly published since Deunff, 1954 neither fully referenced the basionym nor clearly used the name Veryhachium monacanthum.
Now Deunffia (an acritarch genus). Originally Hystrichosphaeridium, subsequently Veryhachium (combination not validly published), thirdly (and now) Deunffia (an acritarch genus). Deunff, 1959 questionably included this species in Veryhachium. This combination was also not validly published in Deunff, 1959 and Cramer, 1963 since these authors did not fully reference the basionym.
Holotype: Deunff, 1951, textfig.4
Age: Middle Ordovician
Combination not validly published since Deunff, 1954 neither fully referenced the basionym nor clearly used the name Veryhachium monacanthum.
Now Deunffia (an acritarch genus). Originally Hystrichosphaeridium, subsequently Veryhachium (combination not validly published), thirdly (and now) Deunffia (an acritarch genus). Deunff, 1959 questionably included this species in Veryhachium. This combination was also not validly published in Deunff, 1959 and Cramer, 1963 since these authors did not fully reference the basionym.
Holotype: Deunff, 1951, textfig.4
Age: Middle Ordovician