Dinosauria Online


ACROCANTHOSAURUS: (ak-ro-KANTH-o-sawr-us) "High-spined Lizard" (Greek akro- = high akantha = spine + sauros = lizard, refering to the spines on its vertebrae)

A CARNOSAUR of Early Creataceous North America. This 40 foot (12m) meat-eating relative of ALLOSAURUS walked on two legs. It had a large head with sharp, sawlike TEETH. Projections up to 17 inches (43 cm) long grew on its vertebarae. These SPINES were probably embedded in a thick ridge of muscle. Acrocanthosaurus is the only known American dinosaur with such high spines. It is known from a skull and most of a skeleton found in Oklahoma and Texas.

A recent flood in Texas uncovered some footprints that scientists think were made by Acrocanthosaurus. Acrocanthosaurus FOSSILS have been found in similar rock hearby. The three-toed footprintes were made by 15 individuals traveling at a high speed. Scientists have calculated that they were running about 25 miles (40 km) per hour. These TRACKS provide evidence that Acrocanthosaurus traveled in HERDS.

Classification: Carnosauria, Theropoda, Saurischia