Eels (Anguilliformes) is a biological order of the phylum Chordata (Chordates) and class Actinopterygii (Ray-finned Fishes).
Colocongridae
Congridae
Synaphobranchidae
Nettastomatidae
Muraenesocidae
Chlopsidae
Anguillidae
Derichthyidae
Muraenidae
Heterenchelyidae
Serrivomeridae
Nemichthyidae
Moringuidae
Myrocongridae
Ophichthidae
Clupeiformes
Lophiiformes
Osmeriformes
Aulopiformes
Batrachoidiformes
Osteoglossiformes
Amiiformes
Siluriformes
Cyprinodontiformes
Anguilliformes
Pleuronectiformes
Gadiformes
Semionotiformes
Zeiformes
Tetraodontiformes
Characiformes
Scorpaeniformes
Cypriniformes
Esociformes
Mugiliformes
Beloniformes
Ophidiiformes
Perciformes
Percopsiformes
Gasterosteiformes
Salmoniformes
Atheriniformes
Acipenseriformes
Synbranchiformes
Elopiformes