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Hi!

Short Answer: Mamenchisaurus. It has the longer neck and could probably reach higher.

Long Answer: it depends many variables.
For example: how they are posed, the age and size of the animals, how flexible their necks are, and the species in question all effect the answer.

The first species of Mamenchisaurus found, Mamenchisaurus contructus, isn't very large, about 13m long. That said, its neck takes up nearly half its total body length. Even though Diplodocus carnegii is over 25m long they might have been similar in height, assuming they could elevate their necks to a similar degree. It might be that Diplodocus necks weren't as flexible as Mamenchisaurus and therefore Mamenchisaurus would be taller. How flexible sauropod ('the long necks'') necks is a debatable issue.

Generally, the second larger Mamenchisaurus species, Mamenchisaurus hochuanensis, would be taller. It has a neck over 9m long where as Diplodocus carnegii's neck is about 6m long. If the necks were carried elevated, at the same angle, then Mamenchisaurus hochuanensis would most certainly be taller than Diplodocus carnegii.

If Diplodocus reared up onto its hind limbs it might have reach about 12m in height. Because Mamenchisauruscontructus probably had a smaller body than Diplodocus, if it reared then it would be shorter. If Mamenchisaurushochuanensis reared it would certainly be taller simply due to the extreme length of its neck.

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15y ago

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