Dino9876 Posted January 1, 2020 Share Posted January 1, 2020 Hello, I saw this tooth for sale on the Internet. Unfortunately the photo was very bad, so I tried to creat a vector graphic. I'm not sure if the tooth belongs to a hemipristis or a blue shark. Can you help me with this? The tooth measures a little over 1cm to the tip and was found in Indonesia (Pacific ocean). Best regards from Germany! My collection of Uncommon extant shark teeth - Here My collection of interesting rare shark jaws - Here Link to comment Share on other sites More sharing options...
fossilselachian Posted January 1, 2020 Share Posted January 1, 2020 Looks like Hemipristis Link to comment Share on other sites More sharing options...
Coco Posted January 2, 2020 Share Posted January 2, 2020 Hi, OK with Hemipristis. Coco ---------------------- OUTIL POUR MESURER VOS FOSSILES : ici Ma bibliothèque PDF 1 (Poissons et sélaciens récents & fossiles) : ici Ma bibliothèque PDF 2 (Animaux vivants - sans poissons ni sélaciens) : ici Mâchoires sélaciennes récentes : ici Hétérodontiques et sélaciens : ici Oeufs sélaciens récents : ici Otolithes de poissons récents ! ici Un Greg... Link to comment Share on other sites More sharing options...
Dino9876 Posted January 2, 2020 Author Share Posted January 2, 2020 Thank you all! My collection of Uncommon extant shark teeth - Here My collection of interesting rare shark jaws - Here Link to comment Share on other sites More sharing options...
siteseer Posted January 3, 2020 Share Posted January 3, 2020 Fossil Prionace teeth have finer serrations and a narrower crown and tend to be smaller overall. It's a little trickier with modern teeth because Hemipristis exists today as a smaller species and the teeth are similar. You can still tell the difference in upper lateral teeth like that one because the serrations on the distal cutting edge (the trailing edge) tend to be noticeably larger. That particular tooth is easier to ID because has a broader crown more like the extinct species. Maybe thirty years ago, I had a chance to sort out a large lot of shark teeth from an Early Pliocene site in California (Oceanside). They had been collected years before that. The vast majority were great whites (Carcharodon carcharias) with some makos (Isurus oxyrinchus) and Carcharhinus (two forms that appeared to be dusky shark and bronze whaler). Out of the whole nearly full beer flat there were just a few angel shark teeth and a few teeth that I thought were odd little Hemipristis. The two upper teeth had smaller serrations than I'd seen with Hemipristis. It was a couple of years later that I read that Prionace was known from the site and I started seeing Prionace from the Pliocene of Peru not too long after that and I made the connection. 2 Link to comment Share on other sites More sharing options...
Dino9876 Posted January 4, 2020 Author Share Posted January 4, 2020 10 hours ago, siteseer said: Fossil Prionace teeth have finer serrations and a narrower crown and tend to be smaller overall. It's a little trickier with modern teeth because Hemipristis exists today as a smaller species and the teeth are similar. You can still tell the difference in upper lateral teeth like that one because the serrations on the distal cutting edge (the trailing edge) tend to be noticeably larger. That particular tooth is easier to ID because has a broader crown more like the extinct species. Maybe thirty years ago, I had a chance to sort out a large lot of shark teeth from an Early Pliocene site in California (Oceanside). They had been collected years before that. The vast majority were great whites (Carcharodon carcharias) with some makos (Isurus oxyrinchus) and Carcharhinus (two forms that appeared to be dusky shark and bronze whaler). Out of the whole nearly full beer flat there were just a few angel shark teeth and a few teeth that I thought were odd little Hemipristis. The two upper teeth had smaller serrations than I'd seen with Hemipristis. It was a couple of years later that I read that Prionace was known from the site and I started seeing Prionace from the Pliocene of Peru not too long after that and I made the connection. Thank you for the explanation! My collection of Uncommon extant shark teeth - Here My collection of interesting rare shark jaws - Here Link to comment Share on other sites More sharing options...
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