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

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