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Miniaturization and morphological evolution in Paleozoic relatives of living amphibians: a quantitative approach

Published online by Cambridge University Press:  23 January 2018

Celeste M. Pérez-Ben ,
Rainer R. Schoch  and
Ana M. Báez
Celeste M. Pérez-Ben
Affiliation:
Konrad Lorenz Institute, Klosterneuburg, Niederösterreich 3400, Austria, and Staaliches Museum für Naturkunde, Stuttgart, Baden-Württemberg 70191, Germany. E-mail: [email protected].
Rainer R. Schoch
Affiliation:
Staaliches Museum für Naturkunde, Stuttgart, Baden-Württemberg 70191, Germany.
Ana M. Báez
Affiliation:
CONICET, Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires 1428, Argentina.
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Abstract

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 to miniaturization, 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.

Type
Articles
Information
Paleobiology , Volume 44 , Issue 1 , February 2018 , pp. 58 - 75
Copyright
Copyright © 2018 The Paleontological Society. All rights reserved 

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