FOSSIL EVIDENCE FOR THE ORIGIN OF AQUATIC LOCOMOTION IN ARCHAEOCETE WHALES

Title

FOSSIL EVIDENCE FOR THE ORIGIN OF AQUATIC LOCOMOTION IN ARCHAEOCETE WHALES

Creator

Thewissen J G M; Hussain S T; Arif M

Publisher

Science

Date

1994
1994-01

Description

Recent members of the order Cetacea (whales, dolphins, and porpoises) move in the water by vertical tail beats and cannot locomote on land. Their hindlimbs are not visible externally and the bones are reduced to one or a few splints that commonly lack joints. However, cetaceans originated from four-legged land mammals that used their limbs for locomotion and were probably apt runners. Because there are no relatively complete limbs for archaic archaeocete cetaceans, it is not known how the transition in locomotory organs from land to water occurred. Recovery of a skeleton of an early fossil cetacean from the Kuldana Formation, Pakistan, documents transitional modes of locomotion, and allows hypotheses concerning swimming in early cetaceans to be tested. The fossil indicates that archaic whales swam by undulating their vertebral column, thus forcing their feet up and down in a way similar to modern otters. Their movements on land probably resembled those of sea lions to some degree, and involved protraction and retraction of the abducted limbs.

Subject

eocene; pakistan; Science & Technology - Other Topics

Format

Journal Article

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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

210-212

Issue

5144

Volume

263

Citation

Thewissen J G M; Hussain S T; Arif M, “FOSSIL EVIDENCE FOR THE ORIGIN OF AQUATIC LOCOMOTION IN ARCHAEOCETE WHALES,” NEOMED Bibliography Database, accessed May 17, 2021, https://neomed.omeka.net/items/show/7330.

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