What is the difference between neoteny and paedomorphosis?

Last Update: April 20, 2022

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Paedomorphosis and neoteny represent two qualitatively different phenomena: neoteny is an adaptive modification of ontogeny, whereas paedomorphosis is its transformation in the course of evolution.

What is the difference between neoteny and paedogenesis?

Neoteny is the phenomena in which the organism is in juvenile stage and physiological (somatic growth) is slow down. But in paedogenesis the larvae of the organism attains sexual maturity. ... Therefore, neoteny is a feature of retarded growth and paedogenesis is of accelerated growth.

What is the meaning of paedomorphosis?

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

What happens paedomorphosis?

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 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.

Neoteny Vs Paedogenesis | Mechanism of Neoteny

31 related questions found

Are humans Neotenic?

Neoteny in humans is the retention of juvenile features well into adulthood. ... Humans also retain a plasticity of behavior that is generally found among animals only in the young. The emphasis on learned, rather than inherited, behavior requires the human brain to remain receptive much longer.

What is an example of Paedomorphosis?

Paedomorphosis has occurred when reproduction is seen in what was ancestrally a juvenile morphological stage. ... The Mexican axolotl opposite is a famous example of paedomorphosis, retaining in maturity the feathery gills that related species lose in infancy.

What causes paedomorphosis?

Progenesis has been suggested as the main cause of paedomorphosis in ophiuroids [34], based on the small size of strongly paedomorphic species. ... Distinguishing paedomorphic states from juvenile ones is not easy, and juveniles of known species have been described as new species.

Are frogs Paedomorphic?

With up to 4750 species, frogs and toads form the most diverse lissamphibian order. The first known Salientia is Triadobatrachus, which, despite having a tail, already presented some typical characteristics of modern frogs, such as a short spine with few vertebras and the hind limbs longer than the front limbs.

Is the example of permanent of neoteny?

They are critically endangered species. Hence, the correct answer is option (D). -Obligate Neoteny- It is also known as permanent neoteny in which the organism does not undergo metamorphosis and stays in the larval form for the entire life. Example- Siren.

What are Paedomorphic features?

Neoteny in humans is the slowing or delaying of body development, compared to non-human primates, resulting in features such as a large head, a flat face, and relatively short arms. These neotenic changes may have been brought about by sexual selection in human evolution.

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.

What is permanent neoteny?

Neoteny describes a form of paedomorphosis or the retention of ancestral juvenile features in descendant adults of a lineage. It is one of the key types of heterochrony that has been recognized and studied for over a century by biologists interested in how shifts in development can lead to macroevolutionary change.

What is neoteny in Amphibia?

Neoteny refers to the retention of a larval or embryonic trait in the. adult body. Familiar examples are retention of embryonic cartilaginous skeleton in adult in Chondrichthyes; and the larval gills in some adult salamanders.

Which type of neoteny is exhibited by Axolotl larva?

Larva of Ambystoma (tiger salamander) is called axolotl larva. It exhibits the phenomenon of neoteny or paedogenesis. If the food and water are scarce and iodine is lacking in water then the axolotl larva leaves water for land and becomes an adult without metamorphosis.

What's an example of convergent evolution?

Convergent evolution is when different organisms independently evolve similar traits. For example, sharks and dolphins look relatively similar despite being entirely unrelated. ... Another lineage stayed put in the ocean, undergoing tweaks to become the modern shark.

Where are caecilians found?

Despite reaching gargantuan lengths, these animals are rarely seen by people. Most species spend a majority of their lives underground or plying the waters of shallow streams. Caecilians can be found in tropical and neotropical areas around the world, from Central and South America to Central Africa and Southeast Asia.

Why is paedomorphosis common in amphibians?

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.

What is obligate paedomorphosis?

Salamanders run the gamut of possible developmental patterns, from complete, obligate metamorphosis, to facultative or partial metamorphosis, to obligate paedomorphosis, in which adults retain larval characters throughout their lives (all cryptobranchids, sirenids, amphiumids, and proteids are obligate paedomorphs).

What is facultative paedomorphosis?

Facultative paedomorphosis is an environmentally induced polymorphism that results in the coexistence of mature, gilled, and fully aquatic paedomorphic adults and transformed, terrestrial, metamorphic adults in the same population.

What is the life cycle of a salamander?

Spotted salamanders progress through several life stages: egg, larva, juvenile, and adult. Their eggs are laid underwater, so when the larvae hatch they have external gills for breathing in their aquatic environment, a broad tail to help them swim, and weak legs.

What is an example of Heterochrony?

Heterochrony is a change in the timing of developmental events. For example, a change in timing might slow down the development of the body, but not alter the maturation of the reproductive system. This change yields an adult organism with a form similar to the ancestral juvenile form.

What are Neotenous features?

These “neotenous” characteristics include a large forehead with lower set eyes, nose and mouth; a smaller, shorter, more recessive chin; fuller lips; larger eyes; a smaller nose; higher, thinner eyebrows; and a rounder, less angular face.

How does macroevolution occur?

Macroevolution refers to evolution of groups larger than an individual species. The history of life, on a grand scale. ... The basic evolutionary mechanisms — mutation, migration, genetic drift, and natural selection — can produce major evolutionary change if given enough time.