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American Zoologist 2001 41(3):586-597; doi:10.1093/icb/41.3.586
© 2001 by The Society for Integrative and Comparative Biology
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A Phylogenetic Perspective on Locomotory Strategies in Early Amniotes1

Stuart S. Sumida2,1 and Sean Modesto3,2
1 Department of Biology, California State University San Bernardino, 5500 University Parkway, San Bernardino, California 92407
2 Bernard Price Institute for Palaeontological Research, University of the Witwatersrand, Johannesburg, PO Wits, 2050, South Africa

Past approaches to understanding the evolution of locomotory strategies among Paleozoic amniotes ("primitive reptiles" of previous parlance) have been influenced by preservational bias: early occurrences of some amniote taxa were used to polarize the acquisition or development of locomotory structures among the earliest amniotes. Using a phylogeny representing the current consensus in the literature, we investigate the major locomotory strategies that have been posited for Paleozoic amniotes (basal synapsids on one hand and early reptiles on the other) by optimizing the major locomotory styles identified for these taxa onto the consensus tree, in order to present an overview of the pattern of evolution of locomotory strategies inherited and adopted by various amniote lineages.


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