Plesiosauria indet. (De Blainville 1835)

This is a dorsal vertebra with the bottom part of the neural arch still intact. It may belong to the family of the Elasmosauridae or even the Pliosauridae. I'm hoping to get some more exact advice at some point, but I have to lay it into professional hands before it may get narrowed down. A rare find from the middle Jurassic staufensis bank, upper Aalenian from the Wutach valley, southern Germany. More views of it are posted here:

http://www.thefossil...-but-which-one/

Update: Nothing new has come of this, since there don't appear to be enough characteristics to narrow down the identification.