Anguilliformity

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Anguilliformity is a morphological pattern in fishes, named for and typified by the eels. Anguilliform fish have a long, slender body, and travel by anguilliform motion. The caudal fin is often emphasized, with the other fins reduced, absent, or fused with the caudal fin. Anguilliformity has evolved independently in many groups, including among others:

Anguilliformes, the eels
Synbranchiformes, the swamp eels
Clariidae, the airbreathing catfishes
Dipnoi, the lungfishes
Cobitidae, the loaches
Gymnotidae, the knifefishes, including the electric eel Electrophorus electricus

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