I cannot be 100% certain that it is not a cetiosaurus but especially given their rarity it is much more likley to be a plesiosaur i have found a plesiosaur vert at abingdon ( Identified by an expert) and it looks very very similar. Also i do posess a few dinosaur vertebra and your photo just doesnt look right for a dinosaur.
Thanks. I have zero verts, more of a teeth collector. But I've been wanting a few verts to put on top of my fossil display. I saw this one but it didn't really match the holotype photos--a similar shape but not really concave like the pics of the cetiosaur holotypes has.
The seller has a couple more for sale, if you don't mind taking a look, see if any of these two look likely to be cetiosaur/sauropod. That would be much appreciated 🙂
To me, vert 2 looks like it could be a sauropod as opposed to plesiosaur. But another, more knowledgable opinion would be great.