Paedomorphosis


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paedomorphosis

[‚pēd·ə′mȯr·fə·səs]
(evolution)
Phylogenetic change in which adults retain juvenile characters, accompanied by an increased capacity for further change; indicates potential for further evolution.

Paedomorphosis

 

the resemblance of an adult individual to its juvenile form. Paedomorphosis is observed when the adult (imago) and juvenile forms exist under the same conditions. It especially characterizes animals with little capacity for movement. Organisms marked by paedomorphosis include the caterpillar-like female casebearers of the family Coleophoridae (although there is a pupal stage between the larval and imago stages) and the wingless females of the orders Embiodea and Grylloblattida. Paedomorphosis may be associated with neoteny.

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Growth and foraging consequences of faeultative paedomorphosis in the tiger salamander, Ambystoma tigrinum nebulosum.
The evolution of any one character may sometimes also be the result of both paedomorphosis and peramorphosis.
It was concluded that paedomorphosis not only was responsible for the reiteration of ancestral juvenile leaves in descendants but also had occurred several times in Lobelioideae.
argyrosperma resulted from paedomorphosis by which the juvenile leaf form was retained from its progenitor.
Although evolutionary changes in leaf morphology have often resulted from paedomorphosis, peramorphosis is also common in leaf evolution.
It has been found that Tp1, Tp2, Cg, and Hsf1-O in maize can slow stage transitions during shoot development and can cause some juvenile stages to be prolonged, a result that could also be called paedomorphosis (Bertrand-Garcia & Freeling, 1991; Freeling et al.
The western tiger salamander (Ambystoma mavortium) exhibits facultative paedomorphosis throughout many parts of its range (western North America).
In order to assay paedomorphosis, fat bodies and gonad tissue of A.
Analysis of allocation to storage, gonad and metamorphic development supports the notion that facultative paedomorphosis is contingent upon environment, and that light is an important additional factor to consider.
The significant effect of light was largely unforeseen, since models of paedomorphosis make no predictions for light regime.