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Neoteny
Neoteny ( 〔''Neoteny.'' (2012). Dictionary.com. Retrieved September 19, 2012, from (link )〕〔''Neoteny.'' (2012). Your dictionary. Retrieved September 19, 2012, from (link ). Pronunciation is shown as (nēŏtˈnē) and in IPA notation it is /niːˈɒtni/ as can be inferred from the (Pronunciation Key ).〕〔''Neoteny.'' (2012). Oxford Dictionaries. Retrieved September 19, 2012, from (link ). Pronunciation is shown as /nēˈätn-ē/ and was changed to IPA notation using Help:IPA for English and the vowels of (fleece ), (lot ), and (happy ).〕
or 〔''Neoteny.'' (2012). Merriam-Webster. Retrieved September 19, 2012, from (link ). Pronunciation is shown as \nē.ˈä.tə.nē\ and was changed to IPA notation using the (pronunciation guide ) and Help:IPA for English.〕), also called juvenilization,〔Montagu, A. (1989). Growing Young. Bergin & Garvey: CT.〕 is one of the two ways by which paedomorphism can arise. Paedomorphism or paedomorphosis is the retention by adults of traits previously seen only in the young, and is a subject studied in the field of developmental biology. Neoteny is found in modern humans.〔(Being More Infantile May Have Led to Bigger Brains )〕 Paedomorphism can also be the retention of larval traits which is commonly studied in salamanders. In neoteny, the physiological (or somatic) development of an organism (typically an animal) is slowed or delayed. In contrast, in progenesis, sexual development occurs faster. Both processes result in paedomorphism, a type of heterochrony.〔Ridley, Mark. ("Neoteny" ), ''Evolution'', Blackwell Publishing, 1985.〕 Ultimately this process results in the retention, in the adults of a species, of juvenile physical characteristics well into maturity and pedogenesis (paedogenesis), the reproduction in a neotenized state.〔Schell, S. C. ''Handbook of Trematodes of North America North of Mexico'', 1985, pg. 22〕
Neoteny is one of three dimensions of heterochrony, or the change in timing of developmental events: acceleration (faster) vs. neoteny (slower), hypermorphosis (further) vs. progenesis (not as far), and predisplacement (begins earlier) vs. postdisplacement (begins later).〔Rice, S. H. ("Heterochrony" ). November 2007. Accessed July 14, 2011.〕
The word ''neoteny'' is borrowed from the German ''Neotenie'', the latter constructed from the Greek νέος (''neos'', "young") and τείνειν (''teínein'', "to extend"). The adjective form of the word is either "neotenic" or "neotenous".〔(Neoteny ), ''The Free Dictionary''. 2011. Accessed April 30, 2011.〕 For the opposite of "neotenic", different authorities use either "gerontomorphic"〔 or "peramorphic".〔
==In humans==
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