Chordata Bateson, 1885 - chordates Class Elasmobranchii Bonaparte, 1838 see Subclass Elasmobranchii Bonaparte, 1838 Subclass Selachii see Subdivision Selachii Order †Pleuropterygii [monotypic] see Order Cladoselachiformes 32 Family †Cladoselachidae Dean, 1894 [monotypic]