Spinosaurus Jaw-Piece or perhaps composite?

[Sauroniops]

Had been talking with a guy selling a spinosaurus jaw-piece, and got the pictures of it today. 

And the first thing that strikes me, is how perfect the teeth look compared to the rest of the jaw. To me, it sorta looks like they were planted there.

 

With that said, there's a tooth in the jaw, that hasn't grown out, which is obviously much harder to make. However it does look like the part on where it sits, has been restored, and thereby the chance of it being placed there. And to me it also looks a bit like there are fillings in-between the two big teeth.

 

I'm very much in doubt about this one, but right now it looks very suspicious to me, so I just wanted to post this here in case some of you guys can confirm that it's fake, composite, or real.

 

[JarrodB]

Pass on that one.

[gigantoraptor]

Jaws from this place have often teeth placed in. The two biggest teeth have most likely been placed in. Can't comment on the little tooth, there isn't enough visible.

 

I am not sure if the jaw piece itself is from a Spinosaurid or a crocodile. Both occured and are often mixed up.

The teeth are from a Spinosaurid indet. There are two described speccies (Sigilmassasaurus brevicollis and Spinosaurus aegyptiacus) and teeth can't be brought down to genus level.

[Sauroniops]

Yea, I think they're definitely placed. Question is though, if the jaw itself is real, or composite, or actually composite crocodile jaws. It looks like there's a lot of filling in-between the teeth, and the jaw bones look very different on each side too.

[gigantoraptor]

9 minutes ago, Sauroniops said:

Question is though, if the jaw itself is real, or composite, or actually composite crocodile jaws. It looks like there's a lot of filling in-between the teeth, and the jaw bones look very different on each side too.

I think the jaw is one piece. Maybe it's glued, but on this picture it seems to be original. The 'putty' between both teeth is probably the stuff the used to put the teeth in the jaw.

[Bguild]

At best, this jaw is a composite. It’s hard to determine if the jaw bone is indeed Spinosaurid, but the teeth were definitely glued in.

[JarrodB]

I would personally pass on it but the seller deals in some top quality stuff and normally stands behind his sales. 

[Troodon]

In my opinion what you are looking at is a Croc jaw with composited Spinosaurid teeth .   Attached find what a spino jaw should like with a big lip on the outside edge, teeth spaced close together, in a irregular pattern and size of tooth sockets.   The matrix in that composite jaw was put there to hold everything together. 

The other comment I will make is that finding real Spinosaurid jaws with functional teeth is unheard of except for possibly an anterior tooth. Typically unerupted teeth are found, this one has 8 I think.  So to find a jaw fragment with two pristine functional teeth is a bit reaching and unrealistic.

[Troodon]

Here is one HamptonsDoc took at the tucson show and posted.   Nice maxilla however all the teeth were placed.  Its standard in the industry to composite teeth in a jaw to aid in the sale but this dealer is very forthright about composites.  

 

[LordTrilobite]

I agree with what Troodon said. Composite jaw with Spinosaurid teeth. And the jaw bone itself is more likely croc. Though I will point out that the teeth on Spinosaurids aren't always that irregularly placed as in the example Troodon presented.

 

29 minutes ago, Troodon said:

Here is one HamptonsDoc took at the tucson show and posted.   Nice maxilla however all the teeth were placed.  Its standard in the industry to composite teeth in a jaw to aid in the sale but this dealer is very forthright about composites.  

 

That's a nearly complete right dentary, not a maxilla. Only the tip is missing. But yeah also composited teeth, as is the standard sadly.

[Troodon]

15 hours ago, LordTrilobite said:

I agree with what Troodon said. Composite jaw with Spinosaurid teeth. And the jaw bone itself is more likely croc. Though I will point out that the teeth on Spinosaurids aren't always that irregularly placed as in the example Troodon presented.

 

That's a nearly complete right dentary, not a maxilla. Only the tip is missing. But yeah also composited teeth, as is the standard sadly.

Yep misspoke thanks