†Machaeracanthus Newberry 1857 (spiny fish)
Parent taxon: Acanthodii according to J. J. Sepkoski 2002
Sister taxa: Acanthodida, Acanthodiformes, Brochoadmones, Climatiiformes, Diplacanthiformes, Gemuendolepis, Gladiobranchus, Gomphacanthus, Homacanthus, Ischnacanthida, Ischnacanthiformes, Nodocosta, Nodonchus, Oracanthus, Parexus, Paucicanthus, Promesacanthus, Seretolepis, Tetanopsyrus, Triazeugacanthus, Yealepis
Subtaxa: Machaeracanthus bohemicus, Machaeracanthus sulcatus
Ecology: nektonic carnivore