Unusual Carboniferous chondrichthyan tooth

[siteseer]

Here's a tooth I bought with several other specimens from the same locality (Upper Burlington Limestone, Biggsville, Henderson County, Illinois) back in the 90's.  It has smooth enamel and is 1 1/2 inches (37mm) along its longest dimension.  I have another tooth much like it but it is much smaller and I've seen other teeth like it but this one is the largest I've seen.  Years ago, one collector thought it could be Chomatodus but that doesn't match what I see elsewhere.  I think it is a tooth form that has been tentatively identified as Orodus or a relative in the past but I don't know Carboniferous teeth like I know Cretaceous-Cenozoic teeth.  This may be a lateral tooth of a taxon with different anterior teeth.

[Fossildude19]

@connorp  @jdp  @JimB88  @Archie

 

Cropped, enlarged, and brightened:

 

 

[siteseer]

Thanks, Tim.

 

Jess