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Mexican-axolotl 780 600x450

The axolotl is one example of a paedomorphic animal. The gills of the salamander area juvenile trait, which the axolotl retains into adulthood. Photo from:Dalton, S. (n.d.). Mexican Axolotl. National Geographic. Retrieved December 1, 2013, from http://animals.nationalgeographic.com/ani


The life cycle of two populations of the northwestern salamander (Ambystoma gracile). From Vertebrates: Comparative Anatomy, Function, Evolution (3rd ed.) by Kenneth Kardong (pg 195)

Paedomorphism is the retention of juvenile traits once an individual individual obtains sexual maturity.


Paedomorphism can be found in many salamander populations and species, which have lost their terrestial forms in favor of their aquatic ones.