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Rodents were diverse and abundant in prehistoric Africa when our human ancestors evolved
Date:12/21/2010

diverse_and_abund.html or to flickr, http://www.flickr.com/photos/52146845@N06/5269535741/.

The analysis is a chapter in the new 1008-page scientific reference book "Cenozoic Mammals of Africa" (University of California Press, 2010), the first comprehensive scientific review of Africa's fossil mammals in more than three decades. The book comprises 48 chapters by 64 experts, summarizing and interpreting the published fossil research to date of Africa's mammals, tectonics, geography, climate and flora of the past 65 million years.

Rodents are human's best friend?

Rodents have been around much longer than humans or human ancestors in Africa, with the earliest from northern Africa dating from about 50 million years ago. Today scientists are aware of 14 families of rodents in Africa.

Winkler cites locales where fossils of the sharp-toothed, gnawing creatures have been found relevant to our human ancestors:

  • Ethiopia's Middle Awash, where some fossils date to when the chimpanzee and human lines split 4 million to 7 million years ago and where the famous "Ardi" primate was discovered;
  • Tanzania's Olduvai Gorge, dubbed the "Cradle of Mankind";
  • The Tugen Hills and Lake Turkana sites of Kenya, where important human ancestor fossils have been discovered;
  • In younger southern African cave faunas dating to the Stone Age.

Their fossils also have been found in other older Eastern Africa sites, where apes and humans have been linked to the monkey lineage.

"At many of these sites, identification of Africa's rodents provides important collaborating information on the ecology of the locales and on environmental change through time," the authors write.

Rodent diversity likely underestimated; more fossils than scientists

The diversity of ancient Africa's rodents most likely has been underestimated, s
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Contact: Margaret Allen
mallen@smu.edu
214-768-7664
Southern Methodist University
Source:Eurekalert  

Page: 1 2 3

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