Here are a couple more micro teeth that I think are very interesting. I picked these up a month or so ago. They were sold as a pair and labeled as Cantioscyllium. They are from the Taylor Marl, Campanian stage, Cretaceous of Landonia Texas.
That is the information the seller provided along with an uncertainty about the ID. I purchased them believing the ID was not correct. I thought the larger one was a Cat Shark tooth. The smaller one I had no clue about.
I have found nothing on line about the fauna of the formation so I am flying blind as far as that goes. I still think the larger one may be a Scyliorhinus. That is based only on similarities with some teeth I have seen from Cretaceous New Jersey. The little one I am still absolutely clueless on. I did find a Eocene Cat shark tooth that looked similar but I really do not know.
Pic 1 and Pic 2 are the larger tooth. Right around 4mm