Shortcut Navigation:
Dimetrodon

Dimetrodon

Dimetrodon

Dimetrodon was one of the earliest relatives of mammals. The large "sail" on its back may have been used for temperature regulation, to attract mates, or to frighten off other animals.

Dimetrodon is a member of a group called synapsids. Behind the eye socket in its skull is the synapsid opening. Its function is uncertain, but it may have been a passage for jaw muscles that helped Dimetrodon and other synapsids chew.

American Museum of Natural History

Central Park West at 79th Street
New York, NY 10024-5192
Phone: 212-769-5100

Open daily from 10 am - 5:45 pm
except on Thanksgiving and Christmas
Maps and Directions

Enlighten Your Inbox

Stay informed about Museum news and research, events, and more!