Whales originated from aquatic artiodactyls in the Eocene epoch of India.

Title

Whales originated from aquatic artiodactyls in the Eocene epoch of India.

Creator

Thewissen J G M; Cooper Lisa Noelle; Clementz Mark T; Bajpai Sunil; Tiwari B N

Publisher

Nature

Date

2007
2007-12

Description

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.

Subject

*Phylogeny; *Whales/anatomy & histology/classification/physiology; Animals; ARTIODACTYLA; BICUSPIDS; CETACEA; EOCENE stratigraphic geology; India; INDIA; MAMMALOGICAL research; Pakistan; Time Factors; UNGULATES; WHALES

Identifier

Rights

Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).

Pages

1190–1194

Issue

7173

Volume

450

Citation

Thewissen J G M; Cooper Lisa Noelle; Clementz Mark T; Bajpai Sunil; Tiwari B N, “Whales originated from aquatic artiodactyls in the Eocene epoch of India.,” NEOMED Bibliography Database, accessed February 26, 2021, https://neomed.omeka.net/items/show/3989.

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