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(nēŏt`ənē), in biology, sexual maturity reached in the larval stage of some animals. Certain environmental conditions can inhibit the completion of metamorphosis; low temperature or lack of available iodine retard the action of the thyroid gland, the larval form may mature sexually, mate, and produce fertile eggs. If environmental conditions improve, neoteny is reversible; i.e., the larvae can complete metamorphosis and attain normal maturity. When neoteny occurs in some salamanders (see axolotlaxolotl
, a salamander, Ambystoma mexicanum, found in certain lakes in the region of Mexico City, which reaches reproductive maturity without losing its larval characteristics.
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), they remain aquatic. In insects, reproduction in the larval stages is known as paedogenesis; it occurs in certain beetles and gall midges. In the midges, the daughter larvae produced within a mother larva consume the mother and escape; the process may continue for several generations.



the ability of certain organisms to attain sexual maturity and reproduce during the larval stage or elsewhere in their early ontogeny.

Neoteny is known to occur in some amphibians, arthropods, and worms, and in many plants. The larvae of the caudate salamanders of the genus Ambystoma, or axolotls, are the classic example of neoteny. Axolotls lost the capacity for metamorphosis but are able to reproduce, retaining the form of an aquatic animal with gills, fins, and other larval organs. Neoteny gave rise to the perennibranch caudate amphibians, such as the cave proteus (Necturus maculosus), the blind newt (Typhlomolge rathbun), and sirenians. These are matured “larvae” that maintain an aquatic mode of life.

In the plant world, neoteny is found among bryophytes, club mosses, ferns, gymnosperms, and angiosperms. For example, the simple organization of structures in the duckweed originated as a result of a cessation in development during one of the earliest stages of ontogeny. An interesting example of neoteny is the female gametophyte in angiosperms, the embryo sac.



[′nē·ə‚tē·nē or nē′ät·ən·ē]
(vertebrate zoology)
A phenomenon peculiar to some salamanders, in which large larvae become sexually mature while still retaining gills and other larval features.
References in periodicals archive ?
At the same time, he illustrates the failure of "aggressive juvenilization of Catholic piety and social concern" with events like the "Search Weekend," in which young people were invited to sing "Kumbayah" and focus on their own spiritual journey rather than the tenets of the faith.
Furthermore, while new prose crafted for a juvenilization may stand in for other material from the source text, it does not necessarily stand for what was expunged.
The juvenilization process in phylogeny and the altricial to precocial forms in the ontogeny of fishes.
As will be shown, specifically with respect to the evolution of paedomorphic organisms, current concepts for the evolution of juvenilization need to be reexamined in light of evidence derived from the female gametophytes of Gnetum for a previously undescribed pattern of progenesis.
14 The passage comes from perhaps Schulz's most Gombrowicz-like story, "The Old Age Pensioner," which parallels Ferdydurke in its description of an adult's juvenilization.
Moreover, the manner in which Odds remakes its precursor text provides a textbook example of the process of the juvenilization of the American cinema.
In an important book, Thomas Doherty (1988) develops a thesis about the juvenilization of American movies in the 1950s.