Amphibia

**Semantic type:** Amphibian

**Definition:** A taxonomic class of vertebrates that include frogs, toads, newts, salamanders, and gymnophiona. Amphibians are cold blooded land animals that lay eggs in the water. The juveniles of this class metamorphose from water-breathing organisms to air-breathing organisms upon adult maturation.

**Synonyms:** - Amphibian - Amphibians