Vertebrata Cuvier, 1812 - vertebrates Gnathostomata Teleostomi ?Class? †Acanthodii Owen, 1846 1 Order †Climatiiformes Berg, 1940 2 Order †Ischnacanthiformes Berg, 1940 [monotypic] 3 Order †Acanthodiformes Berg, 1940 [monotypic]