Molecular Relationships of New Guinean Three-Striped Dasyures, (Myoictis, Marsupialia: Dasyuridae) |
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Authors: | Michael Westerman Jodie Young Steve Donnellan Patricia A Woolley Carey Krajewski |
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Institution: | (1) Department of Genetics, La Trobe University, Bundoora, 3086,, Australia;(2) Evolutionary Biology Unit and Centre for Evolutionary Biology and Biodiversity, South Australian Museum, Adelaide, 5000,, Australia;(3) Department of Zoology, La Trobe University, Bundoora, 3086,, Australia;(4) Department of Zoology, Southern Illinois University, Carbondale, Illinois 62901,, USA |
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Abstract: | Complete nucleotide sequences of the cytochrome b and 12S rRNA genes and partial sequences of the mitochondrial 16S rRNA gene and the nuclear ɛ-globin gene were obtained from
multiple exemplars of the New Guinean dasyurid, Myoictis. Allozyme data were also obtained from most of the same animals. The molecular data show that the genus comprises a number
of genetically distinct lineages which correspond with groups proposed by Woolley (2005) on the basis of a number of morphological traits, including the form of the tail i.e. Myoictis leucura (sp. nov.), M. melas, M. wallacei and M. wavicus (new status). Divergence dates estimated from the weighted-average distances for the combined cytochrome b and 12S rRNA data, calibrated with a dasyurid-thylacine divergence 25 million years ago, suggest that the early cladogenic events separating
Myoictis took place in the late Miocene. Subsequent separation of M. wavicus and M. leucura from a common ancestor as well as some genetic differentiation within M. melas, took place in the medial Pliocene. |
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Keywords: | Myoictis Marsupial Phylogeny Cytochrome b 12S rRNA 16S rRNA Allozymes New Guinea Evolution |
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