What is meant by paedomorphosis?

paedomorphosis, also spelled Pedomorphosis, retention by an organism of juvenile or even larval traits into later life.

What is the difference between neoteny and paedogenesis?

The key difference between neoteny and paedogenesis is that neoteny is the process of delaying the physiological development of an organism, while paedogenesis is the process of reproduction by an organism that has not achieved physical maturity.

What is paedomorphosis in zoology?

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 neoteny with example?

neoteny is the condition in which an organism reaches maturity without losing all of its juvenile characteristics. Typical examples would include becoming sexually viable while still in a larvae stage or retention of gills in an adult.

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.

How many types of neoteny are there?

There are three types of neoteny, obligate, inducible obligate, and facultative. All members of the families Amphiumidae, Sirenidae, Cryptobranchidae, and Proteidae are obligate neotenes, meaning they never fully metamorphose, and retain larval characteristics in varying degrees into adulthood.

What is paedogenesis in ctenophora?

Introduction. Reproduction before metamorphosis in the larval stage owing to delayed somatic growth (neoteny) or precocious maturation (paedogenesis) is known among amphibians and parthenogenetic insects [1]. Marine ctenophores are similarly capable of reproduction in the larval stage [2–5].

What is the difference between Paedomorphosis and Peramorphosis?

Classifying Heterochrony. Heterochrony can be separated into two different types: paedomorphosis (literally “child-shape”) and peramorphosis (literally “beyond-shape”).

What causes Paedomorphosis?

Paedomorphosis is the result of neoteny. This occurs due to the retention of juvenile traits into the adult form, which results in retention of somatic development or progenesis, it increases the development process and the juvenile form becomes a sexually mature adult.

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 difference between paedomorphosis and Peramorphosis?

What is paedomorphosis?

paedomorphosis, also spelled Pedomorphosis, retention by an organism of juvenile or even larval traits into later life. There are two aspects of paedomorphosis: acceleration of sexual maturation relative to the rest of development ( progenesis) and retardation of bodily development with respect to the onset of reproductive activity ( neoteny ).

What is neoteny in humans?

Neoteny is found in modern humans (compared to other primates). In progenesis (also called paedogenesis ), sexual development is accelerated. Both neoteny and progenesis result in paedomorphism (or paedomorphosis ), a type of heterochrony.

What is meant by partial neoteny?

Partial neoteny is the retention of the larval form beyond the usual age of maturation, with possible sexual development (progenesis) and eventual maturation into the adult form; this is seen in the frog Lithobates clamitans.

How does Evolutionary neoteny arise?

Evolutionary neoteny can arise in a species when those conditions occur, and a species becomes sexually mature ahead of its “normal development”. Another explanation for the neoteny in domesticated animals can be the selection for certain behavioral characteristics.