Phylogeny and Biogeography of the Freshwater Crayfish Euastacus
Molecular Phylogenetics and Evolution 37 (2005) 249–263 www.elsevier.com/locate/ympev Phylogeny and biogeography of the freshwater crayWsh Euastacus (Decapoda: Parastacidae) based on nuclear and mitochondrial DNA Heather C. Shull a, Marcos Pérez-Losada a, David Blair b, Kim Sewell b,c, Elizabeth A. Sinclair a, Susan Lawler d, Mark Ponniah e, Keith A. Crandall a,¤ a Department of Integrative Biology, Brigham Young University, Provo, UT 84602-5181, USA b School of Tropical Biology, James Cook University, Townsville, Qld, Australia c Centre for Microscopy and Microanalysis, University of Queensland, Qld 4072, Australia d Department of Environmental Management and Ecology, La Trobe University, Wodonga, Vic. 3689, Australia e Australian School of Environmental Studies, GriYth University, Nathan, Qld 4111, Australia Received 17 November 2004; revised 7 April 2005; accepted 29 April 2005 Available online 18 July 2005 Abstract Euastacus crayWsh are endemic to freshwater ecosystems of the eastern coast of Australia. While recent evolutionary studies have focused on a few of these species, here we provide a comprehensive phylogenetic estimate of relationships among the species within the genus. We sequenced three mitochondrial gene regions (COI, 16S, and 12S) and one nuclear region (28S) from 40 species of the genus Euastacus, as well as one undescribed species. Using these data, we estimated the phylogenetic relationships within the genus using maximum-likelihood, parsimony, and Bayesian Markov Chain Monte Carlo analyses. Using Bayes factors to test diVerent model hypotheses, we found that the best phylogeny supports monophyletic groupings of all but two recognized species and suggests a widespread ancestor that diverged by vicariance.
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