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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.

Hi all, I'm looking for photos or good illustrations of dentitions from a few different sharks from the Paleocene and Eocene to help improve my recognition and to learn better how their teeth varied across the jaw. These could be natural/associated sets or artificial/constructed ones. The sharks I'm looking for are: Jaekelotodus robustus Palaeohypotodus rutoti Brachycarcharias lerichei Isurolamna inflata Can anyone point me toward resources for any of these? If you know of dentitions from different species within these genera, those would be helpful as well. Thanks!

The two shark teeth below are recent personal finds from the Nanjemoy Formation (early Eocene) in Maryland. I'd appreciate any help in ID'ing them. #1: Jaekelotodus robustus? I've been calling this one Jaekelotodus robustus and am curious if that's correct. This tooth measures 27 mm on the slant. #2: Brachycarcharias lerichei? This second tooth has me stumped. I'm leaning toward Brachycarcharias lerichei, but would not be surprised to find out it's something else! This tooth measures a little over 22 mm on the slant. Thanks in advance for any help you can provide!

Hi everyone! Today is received a bunch of unidentified fossil shark teeth found in a now closed sand quarry in Lede Sand, Lede Formation, Balegem, Oosterzele, Belgium (Eocene, Lutetian, 44 mya). I was hoping some of you might help me out with confirming the ID's of the teeth. I have some idea's what the ID might be, but I am not entirely sure about most. Tooth 1 & 2: Definiatly Sandtiger teeth with fine stiations on the crown. That makes me believe that these are probably Striatolamia macrota Tooth 3: Same goes for this one, I also believe this might be Striatolamia macrota Tooth 4: My favorite tooth of the bunch, I am doubting between Brachycarcharias lerichei or Hypotodus verticalis (Upper lateral) Tooth 5: No stiations and a worn cusp 3 mm away fro the base of the crown Hypotodus verticalis? (Upper anterior) Tooth 6: Hypotodus verticalis? (Lower anterior) Tooth 7: Either Hypotodus verticalis or Jaekelotodus robustus Teeth 8 - 11: Brachycarcharias lerichei? Tooth 12: Not sure about this one, maybe Macrorhizodus nolfi anterior tooth or Parotodus sp.? Tooth 13: Looks closest to Xiphodolamia ensis Tooth 14: A tooth with cusps and striations Striatolamia macrota? Tooth 15: small cusps and striated Striatolamia macrota? Tooth 16: I have not really a clue which one this could be. Tooth 17: either Odontaspis winkleri or Brachycarcharias lerichei Tooth 18: Physogaleus secundus Tooth 19: Physogaleus secundus Tooth 20: Physogaleus secundus Tooth 21: Physogaleus secundus Tooth 22: Not sure about this one either. Could it be Jaekelotodus sp. or Paratodus sp.? Tooth 23: Striatolamnia? Tooth 24: Striatolamnia macrota Tooth 25: No sure either it has a weird root and no cusps, maybe Macrorhizodus praecursor? Tooth 26: Brachycarcharias lerichei Tooth 27: Sand Tiger, but which? Tooth 28: Odontaspis winkleri or Carcharias sp. or Hypotodus verticalis? Tooth 29: Brachycarcharias lerichei Tooth 30: Brachycarcharias lerichei Tooth 31: Brachycarcharias lerichei That were all of them, I hope I wasn't too far off with some. I look forward to reading your imput. Thank you in advance!