What does Paedomorphism mean?
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Definition of paedomorphism : retention in the adult of infantile or juvenile characters.
What is the significance of Paedomorphosis?
paedomorphosis Evolutionary change that results in the retention of juvenile characters into adult life. It may be the result of neoteny or progenesis. It permits an ‘escape’ from specialization, and has been invoked to account for the origin of many taxa, from subspecies to phyla.
What is Paedomorphosis quizlet?
what is paedomorphosis? if the rate of reproductive development accelerates compared to somatic development, then a sexually mature stage can retain juvenile structures. so, it is retention of ancestral juvenile character by later ontogenetic stages of descendants.
How does Paedomorphosis occur?
Paedomorphosis has occurred when reproduction is seen in what was ancestrally a juvenile morphological stage. This can be the result of neoteny or progenesis. The Mexican axolotl opposite is a famous example of paedomorphosis, retaining in maturity the feathery gills that related species lose in infancy.
What is obligate paedomorphosis?
Paedomorphosis describes the retention of larval characters in adult stages and is widespread amongst salamanders. It remained unclear, however, whether the stereotypy of prey capture kinematics across morphotypes is restricted to ambystomatids, or can be found in other salamander groups too.
How does macroevolution occur?
Macroevolution is an evolution that occurs at or above the level of the species. It is the result of microevolution taking place over many generations. Macroevolution may involve evolutionary changes in two interacting species, as in coevolution, or it may involve the emergence of one or more brand new species.
How many types of paedomorphosis are there?
There are two types of paedomorphosis found in urodeles. i. Obligatory Paedomorphosis: Some species of urodeles or larval stages always remain mature permanent larval stages.
What is the significance of Paedomorphosis in the evolution of tetrapods?
Paedomorphosis enables some species of salamander to climb forest vegetation; their highly-webbed feet represent paedomorphic evolution in which development of the digits is greatly reduced, making the foot an adhesive surface.
What is the difference between paedomorphosis and Peramorphosis?
Paedomorphosis is the type of heterochrony where there is less growth during ontogeny in a descendant form, compared with its ancestor. In the other form of heterochrony, the descendant undergoes more development and is said to show peramorphosis.
What is Paedomorphosis in salamanders?
Abstract. Paedomorphosis is an alternative process to metamorphosis in which adults retain larval traits at the adult stage. It is frequent in newts and salamanders, where larvae reach sexual maturity without losing their gills. However, in some populations, larvae overwinter in water, while remaining immature.
What is amphibian Paedomorphosis?
Paedomorphosis, common in amphibians, is where adults of a species retain characters found in the larvae of their ancestors. This can occur when development is slowed, giving rise to a sexually mature juvenile — neoteny.