†Triazeugacanthus Miles 1966 (spiny fish)
Parent taxon: Acanthodii according to Miles 1966
Sister taxa: Acanthodida, Acanthodiformes, Brochoadmones, Climatiiformes, Diplacanthiformes, Gemuendolepis, Gladiobranchus, Gomphacanthus, Homacanthus, Ischnacanthida, Ischnacanthiformes, Machaeracanthus, Nodocosta, Nodonchus, Oracanthus, Parexus, Paucicanthus, Promesacanthus, Seretolepis, Tetanopsyrus, Yealepis
Subtaxa: Triazeugacanthus affinis
Ecology: nektonic carnivore