 Its braincase was small.The neck was composed of at least 15 vertebrae and may have been held parallel to the ground and unable to be elevated much past horizontal.The discovery of partial diplodocid skin impressions in 1990 showed that some species had narrow, pointed keratinous spines, much like those on an iguana and up to long, on the "whiplash" portion of their tails, and possibly along the back and neck as well, as in hadrosaurids.