Metamorphosis 1. Change in form of non-reproductive structures between embryo and sexual maturity. 2. Different ecological niche for larvae. 3. Morphological changes at the end of larval life depend upon some environmental cue, either internal (hormone) or external (temperature, photoperiod).
Amphibian Metamorphosis • Anurans (frogs, toads) – Most undergo metamorphosis with larval and adult stages – Some undergo direct development (no free living larval stage) • Urodeles (salamanders, newts) – -most undergo metamorphosis, more subtle – Neoteny- retention of larval features in breeding adult • Caecilians- poorly studied with respect to metamorphosis