Kingdom Animalia Linnaeus, 1758 - animals Phylum Craniata Linnaeus, 1758 see Subphylum Vertebrata Cuvier, 1812 Pisces Class Actinopterygii Woodward, 1891 - ray-finned fishes Order Gymnotiformes Rafinesque, 1810 - American knifefishes Family Gymnotidae Rafinesque, 1815 - nakedback knifefishes