Per Christian Posted July 31, 2021 Share Posted July 31, 2021 (edited) Hi everyone I came across these teeth on our favorite site. It's listed as plesiosaur and ichthyosaur, but could the plesiosaur be a pliosaur tooth? The ridges are quite pronounced.. The teeth in this set were both found in the Seversk Sandstone in Belgorod, Kursk, Russia Edited July 31, 2021 by Per Christian Removed picture with price attached Link to comment Share on other sites More sharing options...
Coco Posted July 31, 2021 Share Posted July 31, 2021 Hi, Indicating the price of the seller is not the best idea, the forum does not talk about money. You should modify your last photo. Coco 1 1 ---------------------- OUTIL POUR MESURER VOS FOSSILES : ici Ma bibliothèque PDF 1 (Poissons et sélaciens récents & fossiles) : ici Ma bibliothèque PDF 2 (Animaux vivants - sans poissons ni sélaciens) : ici Mâchoires sélaciennes récentes : ici Hétérodontiques et sélaciens : ici Oeufs sélaciens récents : ici Otolithes de poissons récents ! ici Un Greg... Link to comment Share on other sites More sharing options...
Per Christian Posted July 31, 2021 Author Share Posted July 31, 2021 23 minutes ago, Coco said: Hi, Indicating the price of the seller is not the best idea, the forum does not talk about money. You should modify your last photo. Coco Indeed, sorry about that! Edited now 1 Link to comment Share on other sites More sharing options...
pachy-pleuro-whatnot-odon Posted July 31, 2021 Share Posted July 31, 2021 I've seen these, and it does indeed concern a platypterygiine ichthyosaur (left, recognizable from the rounded plicidentine enamel folds that germinate equidistant to the tooth apex; Platypterygius sp.) and plesiosaur tooth. All the plesiosaur teeth from this locality have the same type of ornamentation, but I haven't yet found any conclusive source as to what kind of plesiosaur they belong to. The striations indeed look sharp and pronounced enough as to suggest pliosaur to me, but the teeth appear too slender to uphold this hypothesis. I've also seen elasmosaur suggested, but those teeth would be labiolingually compressed and have anastomosing enamel on the lingual face only (see image below): Another suggestion I've seen is that they may be polycotylid, which I don't fully support either. Leptocleidid (to which polycotylidae belongs), however, might be a possibility, as these teeth are obviously far removed from Jurassic plesiosaur species (thus, for me, excluding them belonging to colymbosauridae). May be @RuMert has some more useful thoughts in this, though... 1 1 'There's nothing like millions of years of really frustrating trial and error to give a species moral fibre and, in some cases, backbone' -- Terry Pratchett Link to comment Share on other sites More sharing options...
RuMert Posted July 31, 2021 Share Posted July 31, 2021 (edited) I've never heard about "Seversk Sandstone in Belgorod, Kursk". Belgorod and Kursk are two separate regions. Seversk location doesn't exist there, there's a river called Severskiy Donets (doesn't reach Kursk Oblast though). As Stary Oskol is located in Belgorod Oblast, the seller probably meant the former. I'm not so good at this age and material, looking through Stary Oskol and Shatsk reptile teeth could help Polyptychodon (valid or not) Leptocleidia Edited July 31, 2021 by RuMert 1 My sites & reports Link to comment Share on other sites More sharing options...
pachy-pleuro-whatnot-odon Posted July 31, 2021 Share Posted July 31, 2021 1 hour ago, RuMert said: I've never heard about "Seversk Sandstone in Belgorod, Kursk". Belgorod and Kursk are two separate regions. Hahaha! Well spotted! Hadn't even notice that with how obviously these pieces originate at Stary Oskol 'There's nothing like millions of years of really frustrating trial and error to give a species moral fibre and, in some cases, backbone' -- Terry Pratchett Link to comment Share on other sites More sharing options...
Per Christian Posted July 31, 2021 Author Share Posted July 31, 2021 So i gather from this that it could be pliosaur, but more likely plesiosaur? Really appreciate the feedbacks! Link to comment Share on other sites More sharing options...
pachy-pleuro-whatnot-odon Posted July 31, 2021 Share Posted July 31, 2021 (edited) Yeah, I'd stick with plesiosaur for these teeth, as recognized pliosaur teeth from this locality look distinctly different (source): Also, see the below thread for another example and discussion on pliosaur tooth morphology as applicable to Stary Oskol: Edited July 31, 2021 by pachy-pleuro-whatnot-odon 'There's nothing like millions of years of really frustrating trial and error to give a species moral fibre and, in some cases, backbone' -- Terry Pratchett Link to comment Share on other sites More sharing options...
Per Christian Posted July 31, 2021 Author Share Posted July 31, 2021 8 minutes ago, pachy-pleuro-whatnot-odon said: Yeah, I'd stick with plesiosaur for these teeth, as recognized pliosaur teeth from this locality look distinctly different (source): Also, see the below thread for another example and discussion on pliosaur tooth morphology as applicable to Stary Oskol: I'm in awe of your knowledge, thanks again! My search continues Link to comment Share on other sites More sharing options...
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