Evolution underground: A molecular phylogenetic investigation of Australian burrowing freshwater crayfish (Decapoda: Parastacidae) with particular focus on Engaeus Erichson |
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| Authors: | Mark B. Schultz Sarah A. Smith Pierre Horwitz Alastair M.M. Richardson Keith A. Crandall Christopher M. Austin |
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| Affiliation: | 1. Instituto de Geociencias, IGEO (UCM-CSIC), C/ José Antonio Novais 12, 28040 Madrid, Spain;2. Departamento Cristalografía y Mineralogía, Facultad de Geología, Universidad Complutense de Madrid, C/ José Antonio Novais 12, 28040 Madrid, Spain;3. Departamento de Estratigrafía, Facultad de Geología, Universidad Complutense de Madrid, C/ José Antonio Novais 12, 28040 Madrid, Spain;4. Departamento de Química Física, Facultad de Ciencias Ambientales y Bioquímica, Universidad de Castilla-La Mancha, Ave. Carlos III, s/n, 45071 Toledo, Spain;1. State Key Laboratory of Biogeology and Environmental Geology, School of Earth Sciences, China University of Geosciences, Wuhan 430074, China;2. School of Earth Sciences, University of Bristol, BSB 1 RJ, UK |
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| Abstract: | Phylogenetic relationships and species boundaries of Australian burrowing freshwater crayfish belonging to the genera Engaeus, Engaewa, Geocharax, Gramastacus and Tenuibranchiurus are investigated using combined mitochondrial and nuclear DNA sequence data and Bayesian and Maximum Parsimony methods. Phylogenies are statistically compared to previously published hypotheses. Engaeus, Engaewa, Geocharax, Gramastacus and Tenuibranchiurus form a strongly supported monophyletic clade. This grouping is independently supported by morphology but unites geographically highly disjunct lineages. Our data show two cryptic species in Geocharax, one cryptic species in Gramastacus and two cryptic species within the highly divergent Engaeus lyelli lineage. Using a Bayesian relaxed molecular clock method, the 16S rDNA data show generic-level diversification coinciding with the transition from a wet to arid palaeoclimate near the mid Miocene. |
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| Keywords: | Phylogenetics Biogeography Evolution Relaxed molecular clock Burrowing freshwater crayfish Mitochondrial ribosomal Nuclear protein-coding DNA 16S GAPDH Systematics Australia |
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