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 decrease in vessel element length and imperforate tracheary element length over time, as well as the exclusively upright cells of rays, are hallmarks of paedomorphosis (Carlquist, 1962).
Paedomorphosis in Ambystoma talpoideum: effects of density, food, and pond drying.
The terms paedomorphosis and progenesis have been used for those two phenomena, respectively, but the terms are zoological ones and are doubtfully applicable to organisms with an open system of growth.
Many populations of the western tiger salamander, Ambystoma mavortium, express facultative paedomorphosis.
2005) viewed the occurrence of paedomorphosis as evidence against recapitulation.
Paedomorphosis (juvenile features retained in adults) is a mechanism of evolutionary change sometimes seen as simplification of the body, a feature common in mesopelagic animals (Herring, 2002) and may be the case with C.
1987), wing morphology polymorphisms in insects (Harrison 1980; Roff 1986), seasonal wing color polymorphisms in lepidopterans (Watt 1969; Kingsolver 1995) and facultative paedomorphosis in salamanders (Sprules 1974a; Semlitsch 1987; Whiteman 1994b).
Russell (1916), for example, provides a long list of reasons to reject the biogenetic law as universal, including the existence of heterochronic processes such as paedomorphosis.
Approximately 10% of all species of salamander exhibit paedomorphosis, i.
Brooding and paedomorphosis in the deep-water feather star Comatilia iridometriformis (Echinodermata: Crinoidea).
Alternative evolutionary mechanisms of facultative paedomorphosis in salamanders.
Molecular evidence for multiple episodes of paedomorphosis in the family Hydractiniidae.