Tenontosaurus
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[Photo] Tenontosaurus tilletti, an ornithopod from the Early Cretaceous of North America, pencil drawing. Date April 30, 2007. Author Arthur Weasley http://commons.wikimedia.org/wiki/User:ArthurWeasley

Tenontosaurus (ten-ON-toe-SORE-us) is a medium- to large-sized ornithopod. Formerly thought to be a 'hypsilophodont' (Hypsilophodontia is no longer considered a proper monophyletic clade), it is now considered to be a very primitive iguanodont. The genus is known from the Aptian to Albian stages of the Early to Middle Cretaceous sediments of western North America, dating to around 125 to 105 million years ago. It was about 6.5 metres (22 ft) to 8 metres (27 ft) long and 2.2. meters (7 ft) high, with a mass of somewhere between 1 and 2 tonnes (tons). 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 and a number of skeletons were discovered associated with Tenontosaurus tilletti specimens, implying that this dinosaur was hunted and/or scavenged by Deinonychus.

http://en.wikipedia.org/wiki/Tenontosaurus

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