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Amphibian Ontogeny: Major Trends, Mechanisms, and Paradoxes of Evolution

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Abstract

The relative independence of ontogenetic processes, which is characteristic of amphibians, determines the possibility of shifts in the rate and timing of the ontogenetic events, or heterochronies. Heterochronies give rise to ontogenetic and morphological diversity in amphibians, which can occur without significant genetic changes. Heterochrony-related neoteny, miniaturization and paedomorphic underdevelopment, as well as loss of ancestral traits due to their transition into a latent capacities state with the possibility of secondary recapitulation are phenomena typical of both recent and fossil amphibians.

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ACKNOWLEDMENTS

The authors are deeply grateful to A.A. Tsessarsky and V.L. Trounov for technical assistance in preparing the illustrations.

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Smirnov, S.V., Vassilieva, A.B. Amphibian Ontogeny: Major Trends, Mechanisms, and Paradoxes of Evolution. Paleontol. J. 56, 1257–1273 (2022). https://doi.org/10.1134/S003103012211017X

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