neoteny
noun
the production of offspring by an organism in its larval or juvenile form; the elimination of the adult phase of the life cycle.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
At Rancho Axolotl James A. Peters collected larvae and neotenic individuals in a rocky stream and adults from beneath rocks and logs in the forest near the stream.
From The Amphibians and Reptiles of Michoacán, México by William E. Duellman