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 .....
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http://en.wikipedia.org/wiki/Haplocanthosaurus
Haplocanthosaurus A “single-spined (simple-spined) lizard” from Late Jurassic Colorado, Wyoming, and Utah, USA. This creature was formerly known as Haplocanthus. It was found by paleontologist John Bell Hatcher in 1901 and named by him in 1903.
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http://www.wordinfo.info/words/index/info/view_unit/2727/15
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