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Haplocanthosaurus (meaning "simple spined lizard") is a genus of sauropod dinosaur. Two species, H. delfsi and H. priscus, are known from incomplete fossil skeletons. It lived during the late Jurassic period (Kimmeridgian stage), 155 to 152 million years ago. The type species is H. priscus, and the referred species H. delfsi was discovered by a young college student named Edwin Delfs in Colorado, USA. Haplocanthosaurus specimens have been found in the very lowest layer of the Morrison Formation, along with Hesperosaurus, Brontosaurus yahnahpin, and Allosaurus jimmadensi.


Haplocanthosaurus was one of the smallest sauropods of the Morrison. While some Morrison sauropods could reach lengths of over 20 meters (or over 66 feet), Haplocanthosaurus was smaller, reaching a total length of 14.8 meters (49 feet) and an estimated weight of 12.8 metric tons.

The Land Before Time

Land-before-time6-disneyscreencaps com-1176
In The Land Before Time VI: The Secret of Saurus Rock, a pair of Haplocanthosaurus can be spotted in the background of the scene following Littlefoot's dream, behind a small group of Apatosaurus

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