Sternum and parasternum: Theropleura, Sphenodon, Champsosaurus, Lystrosaurus, and Nyctosaurus, Samuel Wendell Williston, 1925

Illustration of sternum and parasternum of theropleura, sphenodon, champsosaurus, lystrosaurus, and nyctosaurus from the osteology of the reptiles (1925). Date: 1925. The Osteology of the Reptiles p120