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Hey everyone, I've recently been interested in a weird tooth morphology I have found a couple times in the Middle Campanian Ozan of Austin. At the moment, I have it ID'd as Serratolamna cf. caraibaea based off of a paper on Aguja sharks (https://doi.org/10.1016/j.cretres.2016.08.008). My specimens seem to be a single anterior and single lateral. These teeth appear to have a nutrient groove, multiple pairs of cusplets, smooth labial and lingual faces, and a basal bulge overhanging the root. They are each about 11 mm from root to tip of the cusp. Something to note is that S. caraibaea had previously only been found in Mexico, Trinidad, and West Africa. I wonder if it's some warmer water species? I wish I could read the species's original description, but alas I have no access to the paper. (Left): Anterior tooth (L) and lower? lateral tooth (R); (Right): Anterior tooth (L) and lateral tooth (R) (Left): Labial view lower? lateral tooth; (Right): Lingual view lingual tooth I've done some digging trying to find this tooth online from places like the NSR and New Jersey, but the closest I can find is Carcharias samhammeri which I think has too many differences. C. samhammeri imo has a more pronounced lingual protuberance, only a single pair of cusplets, and no basal bulge on the labial side, and "thinner root lobes" (hard to put into words sorry). Carcharias holmdelensis has similar issues along with the presence of striations on the lingual face. Scapanorhynchus doesn't look right and neither does Cretalamna. In fact, what partly prompted me to make this post was noticing this tooth's apparent similarity to a Paleocene/Eocene taxon called Brachycarcharias lerichei. What makes the story even more interesting is its criminal history, formerly being under the name Serratolamna lerichei before the creation of Brachycarcharias of the family Odontaspididae. Brachycarcharias lerichei from elasmo.com. Note the anteriors and laterals! Brachycarcharias lerichei lower lateral from elasmo.com The genus Serratolamna itself also has some shakiness to its name. A similar taxon, Serratolamna khderii, of the Campanian in France and Jordan has a past of jumping in and out of the families Odontaspididae and Serratolamnidae. All this to say I'm beginning to wonder if there is a taxonomic connection between my specimens and the genus Brachycarcharias or at least Odontaspididae that isn't yet recognized in academia. One major issue though, is that I only have a couple of these teeth (I've got a really bad itch to hunt in Austin again, but that'll have to wait). I am wondering if any other Campanian hunters have come across something similar and has photos to share? And for the shark experts, I wonder what are your thoughts on this information? Does it pique your interest or is it a "nothing burger"? Any clarification is immensely appreciated! It's not the craziest or coolest tooth design by any means, but it's enough to keep me longing for some answers.

I found this “sand tiger” tooth in the Miocene Pungo River strata within the Lee Creek mine (Aurora, North Carolina). It does not resemble any other lamniform teeth that I have from the mine, but it does remind me of Brachycarcharias lerechei, an Eocene species. I was thinking it might be reworked. The tooth is 26mm in length, with “wrinkles” on the lingual face @MarcoSr @Al Dente Thoughts?

Hi All, I found these two teeth in Bracklesham Bay, Sussex, UK. After a good while looking at various websites I found a virtually identical tooth marked as Jaekelotodus trigonalis & this species is found at Bracklesham Bay however, I thought the teeth from this shark generally have two cusplets on either side? Other species from this site the teeth are similar to are Hypotodus Atlanticus & Hypotodus verticalis. I don't think it is Striatolamia macrota as there are no striations on the enamel / the cusplets are not scalloped... The height for each is roughly 2.5 cm, there are no serrations along the edges and the second tooth is curved upwards as shown in the second photo (would this difference be as one is from the upper jaw & one from the lower?). Just wanted to check if anyone collects the same species from other locations and could help me with the ID? Any suggestions greatly appreciated!!! Thank you. Richard