talon22 Posted September 30, 2018 Share Posted September 30, 2018 Hi, wanted to ask for opinions about the identification of this partial jaw, offered to me as a Spinosaurus jaw (or Spinosaurid), but unsure on how to tell the difference between a spinosaurid jaw and a crocodilian jaw. Thanks. Link to comment Share on other sites More sharing options...
talon22 Posted September 30, 2018 Author Share Posted September 30, 2018 Link to comment Share on other sites More sharing options...
Max-fossils Posted September 30, 2018 Share Posted September 30, 2018 I suppose this jaw is from Kem Kem; it has exactly the same type of sediments. Here are some of the Kem Kem experts: @LordTrilobite @Troodon @Haravex Max Derème "I feel an echo of the lightning each time I find a fossil. [...] That is why I am a hunter: to feel that bolt of lightning every day." - Mary Anning >< Remarkable Creatures, Tracy Chevalier Instagram: @world_of_fossils Link to comment Share on other sites More sharing options...
LordTrilobite Posted September 30, 2018 Share Posted September 30, 2018 Generally when we see these kinds of topics, it often turns out to be croc. But this one does look like it might be Spinosaurid lower jaw. One thing that is typical of Spinosaurus lower jaw is the lip on the side of the teeth. Some crocs also have this feature but it's less pronounced on those animals. So right now I would lean towards Spinosaur, but it needs to be cleaned to tell for sure. Some reference for Spinosaurus aegyptiacus: The holotype The neotype 2 Olof Moleman AKA Lord Trilobite Link to comment Share on other sites More sharing options...
talon22 Posted September 30, 2018 Author Share Posted September 30, 2018 Thanks LordTrilobite, my main concern is with these fossils turning out to be croc but i'll ask if he can clean it some more. Link to comment Share on other sites More sharing options...
Haravex Posted September 30, 2018 Share Posted September 30, 2018 Highly defined lip on the inside, uneven spacing of the tooth sockets these are not normally found on crocodile jaws. Cleaning the outside of the fossil would help to reveal characteristics however if this fossil is currently in Morocco the chance of them having anything to stabilise it with other than superglue is less than finding golden coprolites coming from a toy rocking horse, this in turn is going to lead to them damaging the fossil given that most Berbers don't do any preparation work I would avoid asking them to do such a task. Thanks Matt 2 Link to comment Share on other sites More sharing options...
talon22 Posted September 30, 2018 Author Share Posted September 30, 2018 6 minutes ago, Haravex said: Highly defined lip on the inside, uneven spacing of the tooth sockets these are not normally found on crocodile jaws. Cleaning the outside of the fossil would help to reveal characteristics however if this fossil is currently in Morocco the chance of them having anything to stabilise it with other than superglue is less than finding golden coprolites coming from a toy rocking horse, this in turn is going to lead to them damaging the fossil given that most Berbers don't do any preparation work I would avoid asking them to do such a task. Thanks Matt Thanks, very informative post. This sort of creates a dilemma because the fossil is currently in Morocco and has been offered by the man who found it....If i want to buy it and have it sent to me then i have to pay for it and wait for it to arrive before letting an expert clean it.......and if it turns out to be something other than a Spinosaurid!. Then again from what i gather from you and LordTrilobite, is that it is likely to be Spinosaurid in origin. Link to comment Share on other sites More sharing options...
LordTrilobite Posted September 30, 2018 Share Posted September 30, 2018 I agree with Haravex. Generally I prefer to prep my own fossils, cheaper that way, though then you sometimes have to take a gamble on a fossil because it might not be clear what the ID is. But if something is not clearly IDable, I think it should be priced as such. Olof Moleman AKA Lord Trilobite Link to comment Share on other sites More sharing options...
gigantoraptor Posted September 30, 2018 Share Posted September 30, 2018 I On 9/30/2018 at 9:34 AM, LordTrilobite said: Generally when we see these kinds of topics, it often turns out to be croc. But this one does look like it might be Spinosaurid lower jaw. One thing that is typical of Spinosaurus lower jaw is the lip on the side of the teeth. Some crocs also have this feature but it's less pronounced on those animals. So right now I would lean towards Spinosaur, but it needs to be cleaned to tell for sure. Some reference for Spinosaurus aegyptiacus: The holotype The neotype What exactly do you mean by the 'lip'? I think it is an awesome piece, no matter what species it is. Link to comment Share on other sites More sharing options...
LordTrilobite Posted September 30, 2018 Share Posted September 30, 2018 1 hour ago, gigantoraptor said: I What exactly do you mean by the 'lip'? I think it is an awesome piece, no matter what species it is. Notice in the first image I posted of the holotype jaw? There's a strong ridge on the inner side of the tooth sockets. That's what I mean by the "lip". 1 Olof Moleman AKA Lord Trilobite Link to comment Share on other sites More sharing options...
TyBoy Posted October 1, 2018 Share Posted October 1, 2018 Check this out Link to comment Share on other sites More sharing options...
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