Molecular evidence from retroposons that whales form a clade within even-toed ungulates

@article{Shimamura1997MolecularEF,
  title={Molecular evidence from retroposons that whales form a clade within even-toed ungulates},
  author={Mitsuru Shimamura and Hiroshi Yasue and Kazuhiko Ohshima and Hideaki Abe and Hidehiro Kato and Toshiya Kishiro and Mutsuo Goto and Isao Munechika and Norihiro Okada},
  journal={Nature},
  year={1997},
  volume={388},
  pages={666-670}
}
The origin of whales and their transition from terrestrial life to a fully aquatic existence has been studied in depth. Palaeontological,, morphological and molecular studies suggest that the order Cetacea (whales, dolphins and porpoises) is more closely related to the order Artiodactyla (even-toed ungulates, including cows, camels and pigs) than to other ungulate orders. The traditional view that the order Artiodactyla is monophyletic has been challenged by molecular analyses of variations in… 
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TLDR
It is concluded that cetaceans evolved from an immediate artiodactyl, not mesonychian, ancestor, thereby shedding light on the origin of whales.
Retroposon analysis of major cetacean lineages: The monophyly of toothed whales and the paraphyly of river dolphins
  • M. Nikaido, F. Matsuno, +8 authors N. Okada
  • Biology, Medicine
    Proceedings of the National Academy of Sciences of the United States of America
  • 2001
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