Phylogenetic Analysis of Diprotodontian Marsupials Based on Complete Mitochondrial Genomes

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  • Munemasa Maruo
    Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology
  • Nikaido Masato
    Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology
  • Donnellan Stephen
    Evolutionary Biology Unit, South Australian Museum
  • Austin Christopher C.
    Museum of Natural Science, Louisiana State University
  • Okada Norihiro
    Graduate School of Bioscience and Biotechnology, Tokyo Institute of Technology Department of Evolutionary Biology and Biodiversity, National Institute for Basic Biology
  • Hasegawa Masami
    Institute of Statistical Mathematics Department of Biosystems Science, Graduate University for Advanced Studies

書誌事項

公開日
2006
DOI
  • 10.1266/ggs.81.181
公開者
日本遺伝学会

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説明

Australidelphia is the cohort, originally named by Szalay, of all Australian marsupials and the South American Dromiciops. A lot of mitochondria and nuclear genome studies support the hypothesis of a monophyly of Australidelphia, but some familial relationships in Australidelphia are still unclear. In particular, the familial relationships among the order Diprotodontia (koala, wombat, kangaroos and possums) are ambiguous. These Diprotodontian families are largely grouped into two suborders, Vombatiformes, which contains Phascolarctidae (koala) and Vombatidae (wombat), and Phalangerida, which contains Macropodidae, Potoroidae, Phalangeridae, Petauridae, Pseudocheiridae, Acrobatidae, Tarsipedidae and Burramyidae. Morphological evidence and some molecular analyses strongly support monophyly of the two families in Vombatiformes. The monophyly of Phalangerida as well as the phylogenetic relationships of families in Phalangerida remains uncertain, however, despite searches for morphological synapomorphy and mitochondrial DNA sequence analyses. Moreover, phylogenetic relationships among possum families (Phalangeridae, Petauridae, Pseudocheiridae, Acrobatidae, Tarsipedidae and Burramyidae) as well as a sister group of Macropodoidea (Macropodidae and Potoroidae) remain unclear. To evaluate familial relationships among Dromiciops and Australian marsupials as well as the familial relationships in Diprotodontia, we determined the complete mitochondrial sequence of six Diprotodontian species. We used Maximum Likelihood analyses with concatenated amino acid and codon sequences of 12 mitochondrial protein genomes. Our analysis of mitochondria amino acid sequence supports monophyly of Australian marsupials + Dromiciops and monophyly of Phalangerida. The close relatedness between Macropodidae and Phalangeridae is also weakly supported by our analysis.<br>

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