Smithsonian National Museum of Natural History Geological Time The Story Of A Changing Earth
Fossil Evidence
Evidence Image
mounted skeleton of Cotylorhynchus, a pelycosaur without a dorsal sail

Common Name:

Scientific Name:
Cotylorhynchus romeri

Time Period:
299-252 mya

Age range:
Early Permian

Key Localities:
Oklahoma, Russia, and France

Mounted skeleton of Cotylorhynchus romeri, a herbivorous pelycosaur. Cotylorhynchus had very small skulls, relative to their 3-meter length, and a hugely expanded rib cage with short limbs. They were probably aquatic or semi-aquatic plant eaters. Photo courtesy of NMNH.


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