The Mexican axolotl (Ambystoma mexicanum) is an amphibian that has a derived mode of development characterized by metamorphic failure. This mode of development results in an entirely aquatic life cycle in which the animal never develops a terrestrial phase. This is an example of paedomorphosis.

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Paedomorphosis is a mode of development where an organism retains juvenile characteristics into its adult stage. The Mexican axolotl's failure to undergo metamorphosis and its retention of larval features, such as gills, into adulthood is a classic example of paedomorphosis, resulting in an entirely aquatic life cycle.

The Mexican Axolotl (Ambystoma Mexicanum) Is an Amphibian That Has