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Lepidosireniformes (class Osteichthyes, subclass Dipneusti) An order of lungfish with a cylindrical body, paired lungs, and nearly filamentous pectoral and pelvic fins. The larvae have tadpole-like external gills. The order includes the African (Protopteridae) and American (Lepidosirenidae) lungfish, which live only in freshwater basins.