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Sauropod spines

A while back, a Diplodocus was found with the impression of iguana-like spines
running down its back---I have a few questions concerning these spines.
1) how far might this trait extend into sauropoda?  Would Brachiosaurus have
had these spines? What about Jobaria?
2) are these spines elongated scales, as in the iguana's spines or bony scutes,
as in the spines of stegosaurs?
3) are these spines associated with the vertebrae under them?  That is, does
every vert have a specific number of spines?