Tenontosaurus
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Extinct (fossil)
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Tenontosaurus (ten-ON-toe-SORE-us) is the most basal member of the dinosaur group Iguanodontia. The genus is known from Early Cretaceous sediments of western North America. It was about 6.5 meters (22 ft) long and 2.2. meters (7 ft) high and weighed about 900 kg. Its tail was longer than other members of the family, and it walked on four feet most of the time.
The genus contains two species, Tenontosaurus tilletti (described by John Ostrom in 1970) and Tenontosaurus dossi (described by Winkler, Murray, and Jacobs in 1997). Many specimens of T. tilletti have been collected from the Cloverly Formation of Wyoming and Montana, and from the Antlers Formation of southern Oklahoma. T. dossi is known from only a handful of specimens collected from the Twin Mountains Formation of Parker County, Texas.
Deinonychus teeth were discovered associated with a Tenontosaurus tilletti specimen, implying that this dinosaur was hunted by Deinonychus packs.
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