Chordata Bateson, 1885 - chordates Class Elasmobranchii Bonaparte, 1838 see Subclass Elasmobranchii Bonaparte, 1838 Subclass Selachii see Subdivision Selachii Order †Pleuropterygii [monotypic] see Order Cladoselachiformes Family †Cladoselachidae Dean, 1894 [monotypic] Genus †Cladoselache Dean, 1894