Fish or amphibian?

[Strepsodus]

I found this upper Carboniferous tooth in the Yorkshire coal field a while ago.  I am unsure if it is from a fish or an amphibian.  It measures 5.5mm long.  Any help to identify it would be greatly appreciated.

 

Thanks,

 

Daniel

[Petalodus12]

I’d say that it’s probably fish, either Rhizodontid or some large Paleoniscoid. It’s a beautiful tooth!

[Fossildude19]

Cropped brightened, and rotated. 

 

Not sure on this one, but I am leaning toward fish. 

Let's see what some others say:

 

@jdp  @Archie  @ckmerlin  @fossilcrazy

 

 

[Archie]

Lovely tooth! I'm also not sure but would lean towards fish, is that a little cap of a different material on the tip?

[Strepsodus]

Thanks for the replies.  Looking at other similar teeth, I agree this is a fish tooth.  I don’t think it matches any of the Rhizodontids in the area (though they are not very well known) but it does look very much like a Paleoniscoid tooth.  I don’t think there is a cap of different material at the tip, though it’s possible that more of the tip is under the matrix.