Fishes Class Sarcopterygii Romer, 1955 - lobe-finned fishes and tetrapods see Clade Sarcopterygii Romer, 1955 Order Lepidosireniformes Savage, 1951 see Order Dipnoi Müller, 1844 Family Lepidosirenidae Stirton, 1953 - South American lungfishes