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Topic: Neoteny


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  Neoteny - Wikipedia, the free encyclopedia
Neoteny describes a process by which paedomorphism is achieved, and is a subject studied in the field of developmental biology.
In neoteny, the physiological (or somatic) development of an animal or organism is slowed or delayed.
Neoteny is derived from the Latin neotenia, derived from the prefix Greek neo-, meaning young, and teinein, to extend.
en.wikipedia.org /wiki/Neoteny   (666 words)

  
 Neoteny
Neoteny is a term in developmental biology that describes the retention of juvenile characteristics in the adults of a species or the attainment of sexual maturity by an organism still in its larval stage, as is found among certain amphibians and insects.
Neoteny is sometimes induced by environmental conditions that inhibit the completion of metamorphosis, such as low temperature or lack of available iodine leading to low thyroid gland activity.
In insects, reproduction in the larval stages is known as paedogenesis; it occurs in the females of certain beetles, Strepsiptera, bagworms, and gall midges[?].
www.ebroadcast.com.au /lookup/encyclopedia/ne/Neoteny.html   (321 words)

  
 Metamorphosis vs Neoteny
Neoteny defined is: The phenomenon of attaining reproductive maturity while retaining the larval external morphology (Duellman and Trueb, 1986).
Based on the endocrinology of metamorphosis, neoteny is thought to be the result of dysfunction at one or more of a number of levels in the endocrine system (Dodd and Dodd, 1976).
Test results have shown that the insensitivity of tissues to thyroid hormones is what causes metamorphic cessation in obligate neotenes (Harris, 1956, as cited by Dodd and Dodd, 1976), while in facultative neotenes the low level of activity in the hypothalamo-pituitary-thyroid axis is responsible for the phenomenon (Duellman and Trueb, 1986).
darkwing.uoregon.edu /~titus/herp_old/neoteny.htm   (1727 words)

  
 Ontogeny's Secrets
Neoteny isn’t a cause; it results from retardation of the ontogeny, and that in turn results from some well-understood ecological conditions operating on populations for evolutionary time spans.
In Ontogeny and Phylogeny Stephen Jay Gould argues that neoteny "occurs in K-Selective regimes, where morphology is fine tuned to immediate ecological conditions." We may think of the K- of K-Selection as standing for Konstant, as in constant population and constant conditions for extended intervals, which usually happen in completely saturated ecosystems.
Because conditions conducive to producing neoteny also tend to accelerate biological change, human neoteny helps explain why life in a nearly aquatic saturated ecosystem dominates our morphology even though our ancestry probably lived in an isolated ecosystem only about half of the time since the hominid-pongid split.
www.interglacial.org /printit/biogen3.htm   (2233 words)

  
 Dienekes' Anthropology Blog: On Neoteny
Neoteny is the retention of infantile traits into adulthood.
Indeed, this is a better candidate for a trait that evolved via neoteny, since young babies have large eyes compared to their faces.
In conclusion, neoteny is an important mechanism of evolution, which is kept in check by other competing forces (sexual dimorphism, natural selection).
dienekes.ifreepages.com /blog/archives/000333.html   (916 words)

  
 Neoteny Blog   (Site not responding. Last check: 2007-11-07)
Neoteny leverages strong contacts in Japan, our ability to communicate and do business in the global financial and technical environment and the experience of our partners in building companies.
Neoteny invests in and supports entrepreneurs who challenge the difficulties of working in Japan to participate in its great opportunities.
Neoteny has completed investment of its capital and is focused on managing the current portfolio.
blog.neoteny.com /neoteny   (315 words)

  
 NuSapiens: Biology, Technology, Philosophy: Neoteny and Human Evolution   (Site not responding. Last check: 2007-11-07)
Neoteny is a term in developmental biology that describes the retention of juvenile characteristics in the adults of a species.
This neoteny trend is being accentuated in modern populations.
Neoteny is associated not only with tame sociability, but also with greater openness, curiosity, and ability to learn.
nusapiens.blogspot.com /2005/02/neoteny-and-human-evolution.html   (645 words)

  
 phil.dhingra.org: neoteny Archives
The examination of the effects of the prolongation of maturation rates, and the carrying of infant features into adulthood, has led to a strange combination of misunderstanding and controversy.
Such a change, technically called neoteny (or paedomorphosis), has in fact occurred often in the course of the evolution of diverse animals (De Beer 1958).
neoteny definition: "Retention of juvenile characteristics in the adults of a species".
www.philosophistry.com /archives/neoteny.html   (218 words)

  
 Neoteny - EvoWiki   (Site not responding. Last check: 2007-11-07)
Neoteny is a process whereby significant evolutionary change can occur with little genetic change through the retention of juvenile traits.
Richard Dawkins in The Ancestor's Tale provides an interesting example of neoteny in his Rendezvous 17 where amphibians join the backward pilgrimage in time.
While this is certainly Pedomorphosis it could result either from neoteny (deferred development) or progenesis (accelerated sexual development).
wiki.cotch.net /index.php?title=Neoteny&printable=yes   (151 words)

  
 Hotspots, Chapter 20
Neoteny is not limited to such gross levels as complete metamorphosis.
Some early evolutionists applied the concept of neoteny to some of the evolutionary changes which have occurred to man. The principle was applied a little too broadly, however, implying that essentially in every trait we represent young anthropoids.
Undoubtedly the most important social force in human neoteny is the penetration of status and status signals into courtship and sexual attraction.
employees.csbsju.edu /lmealey/hotspots/Chapter20.htm   (3658 words)

  
 NuSapiens: Biology, Technology, Philosophy: Baby Faces   (Site not responding. Last check: 2007-11-07)
Neoteny is unevenly distributed amongst modern human populations.
Whether selection in favor of neoteny has global effects on individual human phenotype, as it does in silver foxes, is unknown.
If human neoteny does strongly correlate with tameness and possibly learning ability, then I'd expect it to be under selection in ultradense modern cities, although perhaps mitigated by other selective forces, such as those in favor of aggression, particularly within market economies.
nusapiens.blogspot.com /2005/03/baby-faces.html   (354 words)

  
 Scanning The Spectrum: Neoteny   (Site not responding. Last check: 2007-11-07)
Neoteny is basically the retention of immature features.
The theory you've developed as regards neoteny makes quite a lot of sense.
Neoteny and aspergers, I believe, are directly related - but in ways you might not expect.
theasman.blogspot.com /2005/02/neoteny.html   (259 words)

  
 Amphibian Biology   (Site not responding. Last check: 2007-11-07)
Neoteny, sometimes called paedomophism, is apparent in all caudate families except Rhyacotritonidae.
Facultative neoteny is observed in Salamandridae, Dicamptodontidae, Ambystomatidae, Hynobiidae, and Plethodontidae.
In the case of facultative neoteny, genetics may play a role in the individuals predisposition and affinity for neoteny, however, the cause of neoteny is based on environmental conditions, such that a permanently aquatic lifestyle would benefit the individual.
www.livingunderworld.org /biology/caudata.shtml   (8876 words)

  
 Archaeology Wordsmith   (Site not responding. Last check: 2007-11-07)
neoteny entails the maturation of a larva's reproductive capabilities without the accompanying development of its external morphological features.
Modern man has a number of features which seem to be neotenous, at least in relation to the apes and to the kind of common apelike ancestor we are thought to have.
Neoteny is one possible mechanism to explain the emergence of modern morphology, perhaps from a Neanderthal-like ancestor.
www.reference-wordsmith.com /cgi-bin/lookup.cgi?category=&where=headword&terms=neoteny   (115 words)

  
 Neoteny: The multidisciplinary Implications
In addition, by clicking here, you enter a library of excerpts culled from over six hundred sources focussing on neoteny and neoteny related issues.
An understanding of neoteny offers many bonuses by explaining the exponential growth in hominid brain mass, language development, and the evolution of the idiosyncratic human traits clustered around sex and art.
Neoteny, in addition to driving us toward our characteristic human qualities, may also have created many characteristic human maladies.
www.neoteny.org   (872 words)

  
 Marginal Revolution: Assorted links   (Site not responding. Last check: 2007-11-07)
Furthermore, there are some theories that neoteny (the retaining of infant/child-like characteristics into maturity, such as large, round heads in comparison to body size), is one possible mechanism by which evolution increases mammilian intelligence.
If neoteny (keeping infantile characteristics into adulthood) is really one of the most important mechanism by which mammilian intelligence is increased, then it is kind of a tautology to say that infants (an age at which differerences in neoteny have hardly had a chance to show) have the same mental abilities.
When it says "neoteny ends at 14-17" it means that neoteny is less pronounced (ie: 14-17 year olds have longer limbs and greater musculature, but all adult human's still keep the generally round babyish heads of human infants far more so than adult chimps keep the round babyish heads of chimp-infants).
marginalrevolution.com /marginalrevolution/2006/03/freaknomics_stu.html   (2650 words)

  
 AllRefer.com - neoteny (Zoology: General) - Encyclopedia
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 axolotl), they remain aquatic.
reference.allrefer.com /encyclopedia/N/neoteny.html   (221 words)

  
 Axolotls: The Fascinating Mexican Axolotl and the Tiger Salamander
It is generally accepted that neoteny is a "backward" step in evolution, because the Axolotl is descended from what were once terrestrial salamanders, like the closely related species, the Tiger Salamander, Ambystoma tigrinum and Ambystoma mavortium spp.
Neoteny is sometimes found in other amphibians, but tends to be caused by low levels of iodine (an essential element for animals to make thyroxine hormones, necessary for growth and development), or random genetic mutation.
In the Axolotl, neoteny is now totally genetic (click for more information on the Axolotl's genetics).
www.axolotls.org   (1010 words)

  
 Neoteny in the Human Species   (Site not responding. Last check: 2007-11-07)
This should not be confused with the tendency of hairy men to continue growing hair (in new places) well into their thirties.
Neoteny is the retention of juvenile physical characteristics in the adult individual.
If my interpretation is correct and American Indians exhibit neoteny, this fact in no way affects their ability to function as normal adults.
www.luna.co.uk /~charles/neoteny.htm   (428 words)

  
 neoteny
neoteny The retention of juvenile body characters in the adult state, or the occurrence of adult characters in the juvenile state.(From Glossary of Biotechnology for Food and Agriculture)
"Neoteny" may be the answer, our long gestation and childhood, slowness to come to maturity and retention of juvenile features...
A college dropout, he is the founder and chief executive of Neoteny Co, a venture capital firm that has raised $US40 million ($A58.33 million).
www.mongabay.com /igapo/biotech/neoteny.html   (136 words)

  
 Ch-Ch-Ch-Changes...   (Site not responding. Last check: 2007-11-07)
Neoteny was formed in Lake City, South Carolina in June 1999.
By the middle of June 1999, the band that was to become Neoteny played together for the first time.
Neoteny played to a small crowd Saturday, the 22nd of April, and ripped through a 17 song set.
www.angelfire.com /band/neoteny/aboutneoteny.html   (311 words)

  
 culture - humans - twentyone.html   (Site not responding. Last check: 2007-11-07)
Neoteny is the retention into adulthood of juvenile characteristics.
To say that human beings as a species are characterized by neoteny is to note that, physically, we do not specialize very much as we mature.
In other words, neoteny is related to the remarkable adaptability of human beings, who remain even as adults able to adapt themselves to a wide array of life-situations, rather than fitting perfectly into a single niche.
www.wsu.edu:8001 /vwsu/gened/learn-modules/top_longfor/phychar/culture-humans-21twentyone.html   (251 words)

  
 Star Larvae Addendum: Cyberfetus Rising
Neoteny is a particularly adaptive strategy in rapidly changing environments, such as, we have to suppose, that of human industrial society.
As for the environmental changes that promote human neoteny, technology seems to play a major role, as evidenced by anthropological digs where ancient skeletal remains are peculiarly retarded—they're toothless.
Neoteny and technology feeding off each other—techneoteny—is the primary mode of gene-culture coevolution among human beings.
www.starlarvae.org /Star_Larvae_Addendum_Cyberfetus_Rising.html   (3608 words)

  
 Human - MSN Encarta
The large (averaging 1400 cc/85.4 cu in) brain of Homo sapiens is approximately double that of early human toolmakers.
This great increase in size in only 2 million years was achieved by a process called neoteny, which is the prolongation of retention of immature characteristics.
The juvenile stage of brain and skull development is prolonged so that they grow for a longer period of time in relation to the time required to reach sexual maturity.
encarta.msn.com /encyclopedia_761555694/Human.html   (698 words)

  
 Caudata.org Newt and Salamander Forum: Artificial neoteny in alpine newts
I was just reading in Richard Griffiths book that neoteny is common in alpine newt populations where it is really cold, and that it is possibly caused because the effect of thyroxine is reduced in cold water.
By the way, neoteny is usually now referred to as 'paedomorphosis'; in the scientific literature.
BTW, neoteny is a special case of paedomorphosis.
www.caudata.org /forum/cgi-bin/show.cgi?tpc=13&post=4442   (684 words)

  
 David Brin's Official Web Site: "Neoteny and Two-Way Sexual Selection in Human Evolution" (article)
Neoteny has been taken by many authors to mean the slowing of some or all aspects of somatic development.
A leading hypothesis holds that humans became paragons of adaptability by emphasizing general, species-wide behavioral and mental neoteny.
Further, our offspring are born nearly unformed, or altricial, replacing reflex instinct with lessons drawn from experience and the accumulated wisdom of the tribe, channeled by only the most general of innate predispositions.
www.davidbrin.com /neotenyarticle1.html   (3604 words)

  
 David Brin
Neoteny is directly correlated with the very trait human females needed to attract in males.
Moreover, there is a predictable and tragic consequence to the development of neoteny as an emblem of adult female attractiveness.
Given that women were doomed to be swept into a (more typically male) runaway race of change and adaptation against each other, neoteny may have been the easiest path to take.
psy.ucsd.edu /~dmacleod/141/localcopies/brin.htm   (8774 words)

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