Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/52612
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Type: Journal article
Title: Rapid and repeated limb loss in a clade of scincid lizards
Author: Skinner, A.
Lee, M.
Hutchinson, M.
Citation: BMC Evolutionary Biology, 2008; 8(1):WWW 1-WWW 9
Publisher: BioMed Central Ltd.
Issue Date: 2008
ISSN: 1471-2148
1471-2148
Statement of
Responsibility: 
Adam Skinner, Michael SY Lee and Mark N Hutchinson
Abstract: Background: The Australian scincid clade Lerista provides perhaps the best available model for studying limb reduction in squamates (lizards and snakes), comprising more than 75 species displaying a remarkable variety of digit configurations, from pentadactyl to entirely limbless conditions. We investigated the pattern and rate of limb reduction and loss in Lerista, employing a comprehensive phylogeny inferred from nucleotide sequences for a nuclear intron and six mitochondrial genes. Results: The inferred phylogeny reveals extraordinary evolutionary mutability of limb morphology in Lerista. Ancestral state reconstructions indicate at least ten independent reductions in the number of digits from a pentadactyl condition, with a further seven reductions proceeding independently from a tetradactyl condition derived from one of these reductions. Four independent losses of all digits are inferred, three from pentadactyl or tetradactyl conditions. These conclusions are not substantially affected by uncertainty in assumed rates of character state transition or the phylogeny. An estimated age of 13.4 million years for Lerista entails that limb reduction has occurred not only repeatedly, but also very rapidly. At the highest rate, complete loss of digits from a pentadactyl condition is estimated to have occurred within 3.6 million years. Conclusion: The exceptionally high frequency and rate of limb reduction inferred for Lerista emphasise the potential for rapid and substantial alteration of body form in squamates. An absence of compelling evidence for reversals of digit loss contrasts with a recent proposal that digits have been regained in some species of the gymnophthalmid clade Bachia, possibly reflecting an influence of differing environmental and genetic contexts on the evolution of limb morphology in these clades. Future study of the genetic, developmental, and ecological bases of limb reduction and loss in Lerista promises the elucidation of not only this phenomenon in squamates, but also the dramatic evolutionary transformations of body form that have produced the extraordinary diversity of multicellular organisms.
Keywords: Extremities; Animals; Lizards; DNA, Mitochondrial; Likelihood Functions; Bayes Theorem; Sequence Alignment; Sequence Analysis, DNA; Phylogeny; Body Patterning; Introns; Genetic Speciation; Genes, Mitochondrial; Biological Evolution
Description: © 2008 Skinner et al; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
RMID: 0020084107
DOI: 10.1186/1471-2148-8-310
Appears in Collections:Earth and Environmental Sciences publications
Environment Institute publications

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