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nounSmall mostly terrestrial New World salamanders having neither lungs nor gills as adults.synonyms: Plethodontidae

a family of caudate amphibians. They are close to true salamanders except for the fact that they do not have lungs. Plethodontidae breathe through the skin and the mucous membranes of the mouth and throat. Their length is 8–15 cm. There are approximately 60 species, distributed in North and Central America; one species, the cave salamander ...

... have lungs, but in the large family of lungless salamanders (Plethodontidae) breathing occurs entirely through the skin and the lining of the throat. In a few salamanders growth occurs without metamorphosis, and the gilled, juvenile form is able to reproduce. This phenomenon (called neoteny ) is found in the sirens (family Sirenidae) of S United States and N ...

nounLarge aquatic salamanders: hellbenders; giant salamanders.synonyms: family Cryptobranchidae

... walks on river bottoms and feeds primarily on crayfish and aquatic plants. Mud puppies are classified in the phylum Chordata, subphylum Vertebrata, class Amphibia, order Urodela, family Proteidae.