Snakes across the Strait: trans-Torresian phylogeographic relationships in three genera of Australasian snakes (Serpentes: Elapidae: Acanthophis, Oxyuranus, and Pseudechis).
We analyze the phylogeny of three genera of Australasian elapid snakes (Acanthophis-death adders; Oxyuranus-taipans; Pseudechis-blacksnakes), using parsimony, maximum likelihood, and Bayesian analysis of sequences of the mitochondrial cytochrome b and ND4 genes. In Acanthophis and Pseudechis, we find evidence of multiple trans-Torresian sister-group relationships. Analyses of the timing of cladogenic events suggest crossings of the Torres Strait on several occasions between the late Miocene and the Pleistocene. These results support a hypothesis of repeated land connections between Australia and New Guinea in the late Cenozoic. Additionally, our results reveal undocumented genetic diversity in Acanthophis and Pseudechis, supporting the existence of more species than previously believed, and provide a phylogenetic framework for a reinterpretation of the systematics of these genera. In contrast, our Oxyuranus scutellatus samples from Queensland and two localities in New Guinea share a single haplotype, suggesting very recent (late Pleistocene) genetic exchange between New Guinean and Australian populations.
Wüster
Wolfgang
W
School of Biological Sciences, University of Wales, Bangor LL57 2UW, Wales, United Kingdom. w.wuster@bangor.ac.uk
Dumbrell
Alex J
AJ
Hay
Chris
C
Pook
Catharine E
CE
Williams
David J
DJ
Fry
Bryan Grieg
BG
D000818:Animals; D001315:Australia; D004272:DNA, Mitochondrial; D017815:Elapidae / Q000235:genetics*; D005843:Geography; D006239:Haplotypes; D008928:Mitochondria / Q000235:genetics; D009512:New Guinea; D010802:Phylogeny
D004272:DNA, Mitochondrial