Synbranchiformes

Chaudhuriidae - The earthworm eels are a family of small freshwater eel-like fish related to the swamp eels and spiny eels.

Mastacembelidae - The Mastacembelidae are a family of fishes, known as the spiny eels.

Synbranchidae - The swamp eels are a family of freshwater eel-like fishes of the worldwide tropics.