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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The wood of Salvadoraceae cannot be characterized as paedomorphic.
This site is characterized by a mixed population of paedomorphic and metamorphic salamanders.
We conjecture that this alternative hypothesis supports internal fertilization and the presence of cloacal glands as the pleisiomorphic condition in salamanders and that these features were subsequently lost in some paedomorphic lineages (i.
Density-dependent growth and fecundity in the paedomorphic salamander Ambystoma talpoideum.
Rule is a flexible, less demanding kind of scientific proposition, which could be efficaciously applied to Haeckel's doctrine--allowing paedomorphic phenomena such as neoteny as exceptions.
Some scientists say that domesticated dogs are paedomorphic, meaning that they are stuck in a youthful stage of life.
We used a complete factorial design (2 x 2 x 2) for all combinations of the presence and absence of paedomorphic salamanders, Limnephilus, and Asynarchus, to test the (1) direct effects of salamander predation on each caddisfly species, (2) direct effects of Asynarchus intraguild predation on Limnephilus in large arenas, and (3) indirect effects of salamander predation on caddisfly-caddisfly interactions (Table 1).
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.
Resedaceae have more paedomorphic character state expressions than do Gyrostemonaceae.
high prey abundance, low larval densities, high temperatures) and growth rates are high, some species can employ a paedomorphic life history strategy (Semlitsch, 1987; Ryan and Semlitsch, 1998; Denoel and Joly, 2001; Denoel et al" 2005) in which larvae forego metamorphosis altogether and become reproductively mature adults that exhibit larval morphological characteristics, such as external gills and extensive tail fins.
Most of these paedomorphic species belong to the Family Ambystomatidae, and paedomorphic species are either obligatory paedomorphs or facultative paedomorphs.