Odontogriphus: earliest mollusk
Caron, Jean-Bernard Department of Natural History, Royal Ontario Museum, Toronto, Ontario, Canada.
Scheltema, Amélie H. Woods Hole Oceanographic Institution, Woods Hole, Massachusetts.
Schander, Christoffer Department of Biology, University of Bergen, Bergen, Norway.
Rudkin, David Department of Natural History, Royal Ontario Museum, Toronto, Ontario, Canada.
- General description of mollusks
- Molluscan roots
- Burgess Shale
- Odontogriphus, a Cambrian chimera
- Affinities and ecology
- Early evolution of mollusks revisited
- Links to Primary Literature
- Additional Readings
The origin and early evolutionary history of mollusks, one of the most diverse and fascinating groups of animals alive today, is traditionally based on the study of shells found in fossil deposits dating from the Early Cambrian, about 540 million years ago. Different hypotheses concerning the supposed morphology of the ancestral mollusk have emerged in the last 20 years, one preponderant view being that early forms were microscopic and possessed a simple mineralized shell. The restudy of a collection of half- billion-year-old fossils from the Burgess Shale (a fossil deposit featuring exceptionally preserved Middle Cambrian marine biota located in southern British Columbia) opens new insights concerning early molluscan evolution.
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 39 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