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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Protracted juvenilism (heterochrony, paedomorphosis, or neoteny of various authors) is a feature of angiosperm woods almost exclusively.
Paedomorphosis in Ambystoma talpoideum: effects of density, food, and pond drying.
Tall non-storied rays composed chiefly or entirely of upright cells are indicative of paedomorphosis in wood of the genus.
Many populations of the western tiger salamander, Ambystoma mavortium, express facultative paedomorphosis. Because all ponds freeze, this means that these larval salamanders (and possibly transformed salamander as well) must overwinter under the ice.
Moreover, some changes are consistent with an evolutionary quirk known as paedomorphosis, in which species retain in adulthood the youthful dimensions that their ancestors had as juveniles.
Phylogeny and paedomorphosis in an African family of freshwater fishes (Gonorynchiformes: Kneriidae).
(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).
This feature is present in species with protracted juvenilism (also termed paedomorphosis, which implies sexual reproduction while in a juvenile state of development).
Approximately 10% of all species of salamander exhibit paedomorphosis, i.e., a life cycle where the larval salamander does not metamorphose (Lanoo, 2005).