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Omeisaurus (Beijing Museum of Natural History)


Omeisaurus (Greek for "Omei Mountain lizard"); pronounced OH-may-SORE-us


Woodlands of eastern Asia

Historical Period:

Late Jurassic (165-160 million years ago)

Size and Weight:

About 50 feet long and 5-10 tons



Distinguishing Characteristics:

Large size; extremely long neck


About Omeisaurus:

Pound for pound, Omeisaurus was probably the most common sauropod of late Jurassic China, at least to judge by its numerous fossil remains. Various species of this unusually long-necked plant-eater have been unearthed over the last few decades, the smallest measuring only about 30 feet long from head to tail and the largest having a neck of about the same size. This dinosaur's closest relative appears to have been the even longer-necked sauropod Mamenchisaurus, which had a whopping 19 neck vertebrae compared to the 17 of Omeisaurus.

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