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Text
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URL Address
<a href="http://doi.org/10.1038/nature06343" target="_blank" rel="noreferrer noopener">http://doi.org/10.1038/nature06343</a>
Pages
1190–1194
Issue
7173
Volume
450
Dublin Core
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Title
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Whales originated from aquatic artiodactyls in the Eocene epoch of India.
Publisher
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Nature
Date
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2007
2007-12
Subject
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*Phylogeny; *Whales/anatomy & histology/classification/physiology; Animals; ARTIODACTYLA; BICUSPIDS; CETACEA; EOCENE stratigraphic geology; India; INDIA; MAMMALOGICAL research; Pakistan; Time Factors; UNGULATES; WHALES
Creator
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Thewissen J G M; Cooper Lisa Noelle; Clementz Mark T; Bajpai Sunil; Tiwari B N
Description
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Although the first ten million years of whale evolution are documented by a remarkable series of fossil skeletons, the link to the ancestor of cetaceans has been missing. It was known that whales are related to even-toed ungulates (artiodactyls), but until now no artiodactyls were morphologically close to early whales. Here we show that the Eocene south Asian raoellid artiodactyls are the sister group to whales. The raoellid Indohyus is similar to whales, and unlike other artiodactyls, in the structure of its ears and premolars, in the density of its limb bones and in the stable-oxygen-isotope composition of its teeth. We also show that a major dietary change occurred during the transition from artiodactyls to whales and that raoellids were aquatic waders. This indicates that aquatic life in this lineage occurred before the origin of the order Cetacea.
Identifier
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<a href="http://doi.org/10.1038/nature06343" target="_blank" rel="noreferrer noopener">10.1038/nature06343</a>
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Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).
*Phylogeny
*Whales/anatomy & histology/classification/physiology
2007
Animals
Artiodactyla
Bajpai Sunil
BICUSPIDS
Cetacea
Clementz Mark T
Cooper Lisa Noelle
Department of Anatomy & Neurobiology
EOCENE stratigraphic geology
India
MAMMALOGICAL research
Nature
NEOMED College of Medicine
Pakistan
Thewissen J G M
Time Factors
Tiwari B N
UNGULATES
WHALES