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Plesiosaur or Dinosaur?

Dear colleagues, 
as many of you know, I am trying to study motsly unpublished material 
of Cuban Oxfordian vertebrates. This week I meet 3 articulated 
vertebrae relatively big, labeled as plesiosauria by an old collector. 
I will like listen to the general opinion of someone of you, about: 
How I know if a vertebrae is Dinosaur or Plesiosaur? When a vertebrae 
is Dinosaur and When is Plesiosaur ? 
Please, sorry for my english.