Segisaurus (Greek for "Tsegi Canyon lizard"); pronounced seh-gih-SORE-us
Woodlands of North America
Early-Middle Jurassic (185-175 million years ago)
Size and Weight:
About 3 feet long and 15 pounds
Small size; strong arms and hands; bipedal posture
Unlike its close relative, Coelophysis, fossils of which have been found by the boatload in New Mexico, Segisaurus is known by a single, incomplete skeleton, the only dinosaur remains ever unearthed in Arizona's Tsegi Canyon. Most experts agree that this early theropod pursued a carnivorous diet, though it may have feasted on insects as well as small reptiles and/or mammals. Also, the arms and hands of Segisaurus appear to have been stronger than those of comparable theropods, more evidence for its meat-eating lifestyle.