caimano Posted March 24, 2023 Share Posted March 24, 2023 Hello everyone, I'd like to submit this vertebra to you to understand if it really belongs to packycephalosaurus and possibly if in your opinion how much it has been reworked. Indications on the label: Dimensions: 125mm Origin: Hell Creek Formation, South Dakota, USA CRETACEOUS-Upper Cretaceous, Maastrichtian (66.0-72.1 million years) Thank you very much 1 Link to comment Share on other sites More sharing options...
caimano Posted March 24, 2023 Author Share Posted March 24, 2023 Could it be a good deal? Link to comment Share on other sites More sharing options...
Troodon Posted March 24, 2023 Share Posted March 24, 2023 Looks like a Thescelosaurus sp. dorsal. Cannot comment fully on restoration since I'm not seeing all the sides. There is a different shade not sure if that's fill or shadow. The process I have circled ? may be reattached hard to tell from the photo. Ditto adjacent one. Overall it's nice. Frank 1 Link to comment Share on other sites More sharing options...
caimano Posted March 25, 2023 Author Share Posted March 25, 2023 (edited) Thank you Troodon. Can i ask you something else? You named Thescelosaurus sp. but i've done a little research and can't seem to pinpoint Thescelosaurus in the clade Pachycephalosauria. Ornithischia -> Genasauria -> Neornithischia -> Cerapoda -> Marginocephalia -> Pachycephalosauria. Can you describe the taxonomic tree of Thescelosaurus to me? Is it related to Pachycephalosaurus? Thank you. Edited March 25, 2023 by caimano Link to comment Share on other sites More sharing options...
Troodon Posted March 25, 2023 Share Posted March 25, 2023 It's not closely related it's a Thescelosauridae A quick look from wiki https://en.wikipedia.org/wiki/Neornithischia Link to comment Share on other sites More sharing options...
caimano Posted March 25, 2023 Author Share Posted March 25, 2023 Exactly, actually without the processes, it is difficult to distinguish a Thescelosaurus vertebra from a Pachycephalosaurus one which moreover probably come from the same formation in Dakota or North America, but looking closely at other photos it looks like a Thescelosaurus vertebra. Thank you Troodon. Link to comment Share on other sites More sharing options...
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