Miniaturization and morphological evolution in Paleozoic relatives of living amphibians: A quantitative approach
Miniaturization has been defined as the evolution of extremely small adult size in a lineage. It does not simply imply the decrease of the body size but also involves structural modifications to maintain functional efficiency at a strongly reduced size. Miniaturization has been proposed as a key fac...
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2018
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00948373_v44_n1_p58_PerezBen http://hdl.handle.net/20.500.12110/paper_00948373_v44_n1_p58_PerezBen |
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paper:paper_00948373_v44_n1_p58_PerezBen2023-06-08T15:09:38Z Miniaturization and morphological evolution in Paleozoic relatives of living amphibians: A quantitative approach amphibian body size evolutionary biology functional role morphology ontogeny Paleozoic quantitative analysis skull Amphibia Dissorophoidea Tetrapoda Miniaturization has been defined as the evolution of extremely small adult size in a lineage. It does not simply imply the decrease of the body size but also involves structural modifications to maintain functional efficiency at a strongly reduced size. Miniaturization has been proposed as a key factor in the origin of several major tetrapod clades. Current hypotheses propose that the living amphibians (lissamphibians) originated within a clade of Paleozoic dwarfed dissorophoid temnospondyls. Morphological traits shared by these small dissorophoids have been interpreted as resulting from constraints imposed by the extreme size reduction, but these statements were based only on qualitative observations. Herein, we assess quantitatively morphological changes in the skull previously associated with miniaturization in the lissamphibian stem lineage by comparing evolutionary and ontogenetic allometries in dissorophoids. Our results show that these features are not comparable to the morphological consequences of extreme size reduction as documented in extant miniature amphibians, but instead they resemble immature conditions of larger temnospondyls. We conclude that the truncation of the ancestral ontogeny, and not constraints related tominiaturization, might have been the factor that played a major role in the morphological evolution of small dissorophoids. Based on our results, we discuss the putative role of miniaturization in the origin of lissamphibians within Dissorophoidea. © 2018 The Paleontological Society. All rights reserved. 2018 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00948373_v44_n1_p58_PerezBen http://hdl.handle.net/20.500.12110/paper_00948373_v44_n1_p58_PerezBen |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
amphibian body size evolutionary biology functional role morphology ontogeny Paleozoic quantitative analysis skull Amphibia Dissorophoidea Tetrapoda |
| spellingShingle |
amphibian body size evolutionary biology functional role morphology ontogeny Paleozoic quantitative analysis skull Amphibia Dissorophoidea Tetrapoda Miniaturization and morphological evolution in Paleozoic relatives of living amphibians: A quantitative approach |
| topic_facet |
amphibian body size evolutionary biology functional role morphology ontogeny Paleozoic quantitative analysis skull Amphibia Dissorophoidea Tetrapoda |
| description |
Miniaturization has been defined as the evolution of extremely small adult size in a lineage. It does not simply imply the decrease of the body size but also involves structural modifications to maintain functional efficiency at a strongly reduced size. Miniaturization has been proposed as a key factor in the origin of several major tetrapod clades. Current hypotheses propose that the living amphibians (lissamphibians) originated within a clade of Paleozoic dwarfed dissorophoid temnospondyls. Morphological traits shared by these small dissorophoids have been interpreted as resulting from constraints imposed by the extreme size reduction, but these statements were based only on qualitative observations. Herein, we assess quantitatively morphological changes in the skull previously associated with miniaturization in the lissamphibian stem lineage by comparing evolutionary and ontogenetic allometries in dissorophoids. Our results show that these features are not comparable to the morphological consequences of extreme size reduction as documented in extant miniature amphibians, but instead they resemble immature conditions of larger temnospondyls. We conclude that the truncation of the ancestral ontogeny, and not constraints related tominiaturization, might have been the factor that played a major role in the morphological evolution of small dissorophoids. Based on our results, we discuss the putative role of miniaturization in the origin of lissamphibians within Dissorophoidea. © 2018 The Paleontological Society. All rights reserved. |
| title |
Miniaturization and morphological evolution in Paleozoic relatives of living amphibians: A quantitative approach |
| title_short |
Miniaturization and morphological evolution in Paleozoic relatives of living amphibians: A quantitative approach |
| title_full |
Miniaturization and morphological evolution in Paleozoic relatives of living amphibians: A quantitative approach |
| title_fullStr |
Miniaturization and morphological evolution in Paleozoic relatives of living amphibians: A quantitative approach |
| title_full_unstemmed |
Miniaturization and morphological evolution in Paleozoic relatives of living amphibians: A quantitative approach |
| title_sort |
miniaturization and morphological evolution in paleozoic relatives of living amphibians: a quantitative approach |
| publishDate |
2018 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00948373_v44_n1_p58_PerezBen http://hdl.handle.net/20.500.12110/paper_00948373_v44_n1_p58_PerezBen |
| _version_ |
1768542168179277824 |