Dinosauria Online


TENONTOSAURUS (ten-ON-toh-sawr-us) "Tendon Lizard" (Greek tenonto = sinew + sauros = lizard, referring to the ossified tendons along its backbone)

An ORNITHOPOD of Early Cretaceous North America. This 20 foot (6 m) BIPEDAL plant eater weighed 2 tons (1.8 metric tons) or more. It probably resembled IGUANODON but did not have spiked thumbs. Its TAIL was equipped with bony, rod-like tendons that held the tail rigid when Tenontosaurus ran. Tenontosaurus probably roamed vast areas. Partial skeletons have been found in Montana, Idaho, Wyoming, Texas, and Oklahoma. Perfect SKIN impressions were found in Texas.

Classification: Iguanodontidae, Ornithopoda, Ornighischia