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Does this actually mean what I think it means? That a juvenile sauropod
has a different number of vertebrae than an adult? How do you figure?
> Something which bugs me is that the holotype of _Apatosaurus_ is
> actually an immature specimen - in fact, the characters which Marsh
> originally used to differentiate _Apatosaurus_ from _Brontosaurus_
> (such as lower no. of sacral vertebrae) are juvenile characters.