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Hello I saw this tooth online. I am very confused by the shape of this tooth. Seller thinks it might be from a brachiosaurus. It looks more like a camarasaurus to me however. I've never seen a tooth like it before. It was collected in Moffat County Colorado and measures 1.49 inches..
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Re-acquired my Brachiosaurus sp. tooth after having parted with it 15 years ago. Spent part of yesterday at DMNS with our resident Sauropod expert Virginia Tidwell comparing it with the teeth of the Gunma Museum Camarasaurus skull's dentition we have a great cast of, and the SMA 0002 Camarasaurus skull dentition. And then also with the Berlin Giraffititan Brancai skull's well preserved teeth. Virginia and Ken Carpenter had verified the ID for me when I first owned it years back. But Virginia and I decided to do a double check now that there is better info available. No doubt about it being from Brachiosaurus. Very likely Brachiosaurus altithorax. Distinguishing characteristics from Camarasaurus teeth are the axial twist and the wrinkled enamel going much further down along the neck and root of the tooth. Unfortunately, much of the wrinkled enamel has flaked off along the neck. But there is still plenty enough there to show that it went down much further than all positional teeth on Camarasaurus. And that it is a very good match with the teeth of Giraffititan (formerly Brachiosaurus) branchai, which show the same traits. Later Early Cretaceous brachiosaurs/titanosauromorphs show the same axial twist with the lengthened enamel. Though the teeth by this point start showing more narrowing of the crown. Before anyone throws out the tooth that is figured in Carpenter and Tidwell's paper on the Felch Quarry Brachiosaurus skull. Virginia acknowledged my observation that that crown looks like a Camarasaurus tooth. There was concern about that, but no other Camarasaurus bones were found in that specific Quarry. So ultimately, though there was doubt, the decision was made by Ken Carpenter to include that tooth in the restoration of the skull. So, yes, all bases were covered yesterday. Brachiosaurus sp. (probably Brachiosaurus altithorax) Late Jurassic Morrison Formation Como Bluff Albany County, Wyoming USA
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