Origins of modern amphibians
Anderson, Jason S. Faculty of Veterinary Medicine, University of Calgary, Calgary, Alberta, Canada.
- Problem of origin
- New fossils
- Molecular studies
- Links to Primary Literature
- Additional Readings
The evolutionary origin of modern-day amphibians [Lissamphibia: frogs and toads (Anura), salamanders and newts (Urodela or Caudata), and the limbless caecilians (Apoda; “rubber eels”); Fig. 1] has been one of the more vexing problems confronting biologists for many years. In the past decade in particular, this issue has been contentious, with three different hypotheses offered to solve the problem. This controversy has, in turn, motivated new research from several different angles, including paleontology, anatomical- and molecular-based analyses of relationship, and molecular-based estimates of divergence timing (“molecular clocks”). The evidence has been mounting, especially in recent years, and a resolution appears to be in sight. This article briefly examines the controversy and some of the new evidence from fossils and molecular studies that is helping to establish the origins of modern amphibians.
The content above is only an excerpt.
for your institution. Subscribe
To learn more about subscribing to AccessScience, or to request a no-risk trial of this award-winning scientific reference for your institution, fill in your information and a member of our Sales Team will contact you as soon as possible.
to your librarian. Recommend
Let your librarian know about the award-winning gateway to the most trustworthy and accurate scientific information.
AccessScience provides the most accurate and trustworthy scientific information available.
Recognized as an award-winning gateway to scientific knowledge, AccessScience is an amazing online resource that contains high-quality reference material written specifically for students. Its dedicated editorial team is led by Sagan Award winner John Rennie. Contributors include more than 9000 highly qualified scientists and 42 Nobel Prize winners.
MORE THAN 8500 articles and Research Reviews covering all major scientific disciplines and encompassing the McGraw-Hill Encyclopedia of Science & Technology and McGraw-Hill Yearbook of Science & Technology
115,000-PLUS definitions from the McGraw-Hill Dictionary of Scientific and Technical Terms
3000 biographies of notable scientific figures
MORE THAN 17,000 downloadable images and animations illustrating key topics
ENGAGING VIDEOS highlighting the life and work of award-winning scientists
SUGGESTIONS FOR FURTHER STUDY and additional readings to guide students to deeper understanding and research
LINKS TO CITABLE LITERATURE help students expand their knowledge using primary sources of information