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Amphiumidae (Congo eels, lamper eels; class Amphibia, order Urodela) A family of eel-like, semi-larval salamanders that have a cylindrical body up to 1 m long, rudimentary limbs and lungs, small, lidless eyes, no tongue, and external gills that are lost in adults. They are nocturnal feeders on small invertebrates. They may leave the water in wet weather. Eggs are laid in a nest. Fertilization is external, with no spermatophore. There is a single genus, Amphiuma, and three species, occurring in freshwater swamps in the south-eastern USA.