Segisaurus

Segisaurus (meaning "Tsegi Canyon lizard") is a genus of small coelophysid theropod dinosaur, that measured approximately 1 metre (3.3 feet) in length. The only known specimen was discovered in early Jurassic strata in Tsegi Canyon, Arizona, for which it was named. Segisaurus is the only dinosaur to have ever been excavated from the area.

==Description== thumb|left|Restoration Segisaurus lived sometime between ~200 and 195 million years ago during the Jurassic period. It was a primitive bipedal theropod roughly around the size of a goose. Segisaurus was 1 meter (3.3 feet) long, half a meter (1.65 feet) tall and weighed about 4-7 kilograms. It was nimble and insectivorous, although it may have scavenged meat also. It was bird-like in structure, with a flexible, elongated neck and stout body. Segisaurus was three-toed and had powerful legs that were long compared to its body length. Like its legs, Segisaurus had a long tail and long forearms. Its furcula bone was not unlike a bird's, thus strengthening scientists' arguments that dinosaurs were related to avians. Segisaurus is described from the only specimen ever found, the holotype UCMP 32101, which was a sub-adult. The full size of Segisaurus as an adult may never be known. Furculae were found in the Segisaurus specimen, making it one of the first known non-avian dinosaurs to preserve furculae found. These furculae were initially thought to be clavicles, which led Charles Lewis Camp to speculate that the "splint-like" neck ribs supported a Draco-like patagium along the neck, to improve the animal's ability to move quickly. Segisaurus is significant because it demonstrates that the clavicle was primitively present in early theropods.