Surangular

File:Proceratosaurus bradleyi Skull Reconstruction (alt).png

Skull diagram of the dinosaur Proceratosaurus, showing location of surangular

File:Dimetrodon skull lateral.svg

Skull and jaws diagram of the primitive synapsid Dimetrodon, showing location of surangular

The surangular or suprangular is a jaw bone found in most land vertebrates, except mammals. Usually in the back of the jaw, on the upper edge, it is connected to all other jaw bones: dentary, angular, splenial and articular. It is often a muscle attachment site. It has been noted in dinosaurs.