Clade Euselachii Hay 1902
Chondrichthyes - Elasmobranchii
Full reference: O. P. Hay. 1902. Bibliography and Catalogue of the Fossil Vertebrata of North America. Bulletin of the United States Geological Survey 179:1-868
Parent taxon: Cladodontomorphi according to M. Ginter et al. 2010
Sister taxa: Cladoselachiformes, Ctenacanthiformes, Hybodontiformes, Squatinactiformes, Symmoriiformes
Subtaxa: Acronemus, Hueneichthys, Hybodontida, Neoselachii, Orectoloboidei, Protacrodontoidea, Sphenacanthidae, Squatinoidei, Surcaudalus, Synechodontidae