Citation for Study 12742
Crawford N.G., Faircloth B.C., Mccormack J.E., Brumfield R., Winker K., & Glenn T.C. 2012. More than 1000 ultraconserved elements provide evidence that turtles are the sister group of archosaurs. Biology Letters, : 1-4.
- Crawford N.G. (submitter) 6174603680
- Faircloth B.C. 310-415-7551
- Mccormack J.E.
- Brumfield R.
- Winker K.
- Glenn T.C.
We present the first genomic-scale analysis addressing the phylogenetic position of turtles, using over 1000 loci from representatives of all major reptile lineages including tuatara. Previously, studies of morphological traits posi- tioned turtles either at the base of the reptile tree or with lizards, snakes and tuatara (lepido- saurs), whereas molecular analyses typically allied turtles with crocodiles and birds (archo- saurs). A recent analysis of shared microRNA families found that turtles are more closely related to lepidosaurs. To test this hypothesis with data from many single-copy nuclear loci dis- persed throughout the genome, we used sequence capture, high-throughput sequencing and pub- lished genomes to obtain sequences from 1145 ultraconserved elements (UCEs) and their vari- able flanking DNA. The resulting phylogeny provides overwhelming support for the hypothesis that turtles evolved from a common ancestor of birds and crocodilians, rejecting the hypothesized relationship between turtles and lepidosaurs.
turtles; ultraconserved elements; phylogenomics; evolution; archosaurs
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