Rieppel, Olivier C. Department of Geology, The Field Museum, Chicago, Illinois.
Zangerl, Rainer Formerly, Department of Geology, Field Museum of Natural History, Chicago, Illinois.
- Evolutionary trends
- Related Primary Literature
- Additional Reading
A small group of marine reptiles forming part of the Sauropterygia, known only from deposits of Triassic age in Europe, the Near East (Israel), North Africa (Tunisia), and China. The earliest occurrence of placodonts is in the uppermost Lower Triassic (upper Buntsandstein) of Upper Silesia (Poland); their latest occurrence is in the very late Triassic (Rhaetian) of the Southern Alps. Placodonts are reptiles with a grossly specialized dentition—flat-crowned teeth located in both the upper and lower jaws and on the palate—that functioned as a crushing device for hard-shelled invertebrate prey such as brachiopods, gastropods, clams, and cephalopods (see illustration). See also: Sauropterygia
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. Contributors include more than 9000 highly qualified scientists and 43 Nobel Prize winners.
MORE THAN 8700 articles 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 19,000 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