neotenous

noun Biology.

1. Also called pedogenesis. the production of offspring by an organism in its larval or juvenile form; the elimination of the adult phase of the life cycle.
2. a slowing of the rate of development with the consequent retention in adulthood of a feature or features that appeared in an earlier phase in the life cycle of ancestral individuals: Neoteny in the ostrich has resulted in adult birds sporting the down feathers of nestlings.

noun

1. the persistence of larval or fetal features in the adult form of an animal. For example, the adult axolotl, a salamander, retains larval external gillsSee also paedogenesis

n.retention of juvenile characteristics in adult life, 1901, from German neotenie (1884), from Greek neos “young” (see new) + teinein “to extend” (see tenet). n.

1. The attainment of sexual maturity by an organism still in its larval stage.

1. The retention of juvenile characteristics in the adults of a species. Humans, for example, are sometimes said to demonstrate neoteny by retaining through adulthood the relatively large head and hairlessness characteristic of very young primates. The body proportions of flightless birds, which resemble those of fetal flying birds, are also considered to be evidence of neoteny.
2. The attainment of sexual maturity by an organism still in its larval stage, seen in certain amphibians and insects. Certain species of salamanders, for instance, demonstrate neoteny as they become sexually mature but remain aquatic and do not develop legs. Neoteny sometimes occurs in response to environmental stresses such as low temperature or lack of iodine (which is essential for the thyroid gland). If environmental conditions improve, the organism can often develop into a fully mature adult form.