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Related Experiment Video

Updated: Jul 3, 2026

Generation of Chimeric Axolotls with Mutant Haploid Limbs Through Embryonic Grafting

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Published on: January 29, 2020

[Direct development in the tailed amphibians (salamanders), its origin and evolution].

Zhurnal Obshchei Biologii

|August 6, 2008

Summary

Amphibians can evolve direct development, bypassing aquatic larvae, a primitive trait. This transition involves internal developmental shifts and appears to follow universal mechanisms across diverse amphibian groups.

Area of Science:

Evolutionary developmental biology
Amphibian reproductive strategies
Comparative embryology

Context:

Amphibians exhibit a primitive biphasic life cycle with aquatic larvae and terrestrial adults.
Direct development, where ontogenesis occurs within the egg, is an independently evolved trait in various amphibian lineages.
Understanding the transition from larval to direct development provides insights into evolutionary pathways.

Purpose:

To investigate the pathways, mechanisms, and evolutionary tendencies of direct development in amphibians, focusing on plethodontid salamanders.
To identify the ontogenetic prerequisites and regulatory shifts associated with the evolution of direct development.
To compare the mechanisms of transition to direct development across different amphibian orders (Apoda, Urodela, Anura).

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Last Updated: Jul 3, 2026

Generation of Chimeric Axolotls with Mutant Haploid Limbs Through Embryonic Grafting

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Published on: January 29, 2020

Reproductive Techniques for Ovarian Monitoring and Control in Amphibians

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Published on: May 12, 2019

Inhibition of Wound Epidermis Formation via Full Skin Flap Surgery During Axolotl Limb Regeneration

Inhibition of Wound Epidermis Formation via Full Skin Flap Surgery During Axolotl Limb Regeneration

Published on: June 24, 2020

Summary:

Direct development in amphibians involves the progressive displacement of larval stages into embryogenesis, desynchronization of metamorphic processes, accelerated thyroid gland activity, and reduced hormonal regulation.
The transition to direct development shows convergent evolutionary patterns and universal regulatory mechanisms in both Anura and Urodela.
Ontogenetic prerequisites include dissociability of larval and adult stages or a lack of extreme larval specialization.

Impact:

Reveals convergent evolutionary mechanisms for direct development across amphibian taxa.
Highlights the plasticity of amphibian development and the role of endocrine regulation in evolutionary transitions.
Provides a framework for understanding the evolution of terrestrial life cycles in vertebrates.