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BIOLOGICAL SIGNIFICANCE OF METAMORPHOSIS VS NEOTENY ... Metamorphosis defined is: A series of abrupt postembryonic changes involving structural, physiological, biochemical, and behavioral transformations (Duellman & Trueb, 1986). In amphibians, these changes are of three main types: (1) regression of structures...
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www.uoregon.edu/~titus/herp_old/neoteny.htm
www.uoregon.edu/~titus/herp_old/neoteny.htm
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The Axolotl is a fascinating creature for a number of reasons, including its grotesque appearance, its ability to regenerate, and primarily the fact that it exhibits the phenomenon known as neoteny. Ordinarily, amphibians undergo metamorphosis from egg to larva (the tadpole of a frog is a larva), and finally to adult form.
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Glossary of Useful Herpetological Terms ... Neoteny: some amphibians are able to become reproductively mature in the larval state and never mature into the adult form; retain larval characteristics. Nocturnal: of or relating to activity at night; a nocturnal organism is active primarily at night, and rests during the day.
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fl.biology.usgs.gov/herps/Glossary/glossary.html
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Our current knowledge of the thyroid axis in the lungfish, Neoceratodus forsteri, is consistent with neoteny in amphibians, but the only Devonian fossil considered to be a larval lungfish bears no resemblance to living lungfish or to panderichthiads.
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www.ncbi.nlm.nih.gov/pubmed/16337631
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Amphibians begin life in the water as tadpoles but as adults spend most of their time on land. But a Mexican salamander found life in the water more comfortable than the struggle on land and a neotenous change occurred to adapt it for such a life. ... The baboon successfully made the same transition without invoking neoteny.
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web.ukonline.co.uk/michael.magee/awwls/00/wls137.html
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Neoteny - Wikipedia, the free encyclopedia
Neoteny (pronounced /niːˈɒtɨniː/ ), also called juvenilization , is the retention, by adults in a species, of traits previously seen only in juveniles (a kind of pedomorphosis), and is a subj...
en.wikipedia.org/wiki/Neoteny
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Neoteny plays a role in evolution, as a means by which, over generations, a species can undergo a significant physical change. In such cases, a species’ neotenous form becomes its “normal” mature form, no longer dependent upon environmental triggers to inhibit maturity.
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tinywiki.org/neoteny.html
tinywiki.org/neoteny.html
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Many modern amphibians have biphasic life cycles with aquatic larvae and terrestrial adults. The central questions are how and when this complicated ontogeny was established, and what is known about the lives of amphibians in the Paleozoic. ... Neoteny: a life history strategy only known in amphibians, in which sexual...
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arjournals.annualreviews.org/doi/abs/10.1146/annurev.ea...
arjournals.annualreviews.org/doi/abs/10.1146/annurev.earth.031208.100113
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Amphibians (learn about them) ... In the same fashion, some aquatic salamanders, such as the Northwestern salamander does not metamorphose; they live their entire life in their larval form. This process is called neoteny.
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www.fws.gov/columbiariver/games/scramble/amphibianwords...
www.fws.gov/columbiariver/games/scramble/amphibianwords.htm
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