Fishes 1 Class Myxini (Jaekel, 1911) see Subclass Myxinoidea 2 Class Cephalaspidomorphi Moy-Thomas & Mile, 1971 3 Class Elasmobranchii Bonaparte, 1838 see Subclass Elasmobranchii Bonaparte, 1838 4 Class Holocephali Bonaparte, 1832 see Superorder Holocephali Bonaparte, 1831 5 Class Actinopterygii Woodward, 1891 - ray-finned fishes 6 Class Sarcopterygii Romer, 1955 - lobe-finned fishes and tetrapods see Clade Sarcopterygii Romer, 1955