Minnesota Nice Posted December 27, 2016 Share Posted December 27, 2016 Would love to have a definitive ID on this small vertebra from the White River Formation Jackson County South Dakota. Frango Ut Patefaciam...I Break in Order to Reveal Link to comment Share on other sites More sharing options...
Spinosaurus Posted December 27, 2016 Share Posted December 27, 2016 i think its oreodont. i found this picture on google and it looks like yours Link to comment Share on other sites More sharing options...
jpc Posted December 28, 2016 Share Posted December 28, 2016 Mammal.... it might be oreodont sized, but mammal verts can all look quite similar,esp without the processes. My answer: oreodont-sized mammal. 1 Link to comment Share on other sites More sharing options...
LordTrilobite Posted December 28, 2016 Share Posted December 28, 2016 It's hard to tell because the bone hasn't been completely cleaned yet. But it looks like the centrum might not have fused with the neural arch. In which case, it would be a juvenile. 1 Olof Moleman AKA Lord Trilobite Link to comment Share on other sites More sharing options...
Minnesota Nice Posted December 28, 2016 Author Share Posted December 28, 2016 2 hours ago, LordTrilobite said: It's hard to tell because the bone hasn't been completely cleaned yet. But it looks like the centrum might not have fused with the neural arch. In which case, it would be a juvenile. LordTrilobite, If its not to much trouble can you expand on your comment regarding the fused centrum and neural arch. I did a little prep but stopped because I didn't want to do any damage. What should I be looking for to confirm a juvenile? Frango Ut Patefaciam...I Break in Order to Reveal Link to comment Share on other sites More sharing options...
LordTrilobite Posted December 28, 2016 Share Posted December 28, 2016 I did a quick search for some example images. Vertebrae are made of two bones. The centrum and the neural arch. In juveniles these are not fused. If it is indeed unfused. You'll want to look for a structure that looks like this. Notice how it's very rough, this surface interlocks with the bone that's attached to it. In older individuals this will be fused. If it is fused. The spot where the neural arch would have attached will not have this structure, it will just look like broken bone. 4 Olof Moleman AKA Lord Trilobite Link to comment Share on other sites More sharing options...
Ridgehiker Posted December 28, 2016 Share Posted December 28, 2016 13 hours ago, jpc said: Mammal.... it might be oreodont sized, but mammal verts can all look quite similar,esp without the processes. My answer: oreodont-sized mammal. Agreed. Everything about it matches the oreodont vertebrae I have found...especially the end shape. However, JPC makes a good point in that one needs to be aware of similar shaped vertebrae from other mammals. We also run into this with dino vertebrae...at the extreme they can be quite distinct but there is a continuum where there can be crossover characteristics and I will put 'probable' on the label. Link to comment Share on other sites More sharing options...
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