Pelves and sacrum: Varanus, Erythrosuchus, Rutiodon, and Nyctosaurus, Samuel Wendell Williston, 1925

Illustration of pelves and sacrum of varanus, erythrosuchus, rutiodon, and nyctosaurus from the osteology of the reptiles (1925). Date: 1925. The Osteology of the Reptiles p145 Fig-118