sharko69 Posted November 26, 2019 Share Posted November 26, 2019 Found this little tooth this weekend. I’m sure it must be a S. raphiodon but the cusplets come directly out of a broader based blade. Not like the others I usually find. May just be because it is a juvenile? 1 Link to comment Share on other sites More sharing options...
Dirtlark Posted November 26, 2019 Share Posted November 26, 2019 I think it looks like a sand shark, especially with how narrow and angular it is, as well as the striations. I think the coloring might help pinpoint what type of sand shark. Hope this helps. Link to comment Share on other sites More sharing options...
siteseer Posted November 26, 2019 Share Posted November 26, 2019 5 hours ago, Dirtlark said: I think it looks like a sand shark, especially with how narrow and angular it is, as well as the striations. I think the coloring might help pinpoint what type of sand shark. Hope this helps. I think it's a sand shark too - Carcharias sp. Without size or site info it's hard to say beyond that. Link to comment Share on other sites More sharing options...
Ludwigia Posted November 26, 2019 Share Posted November 26, 2019 6 hours ago, Dirtlark said: I think it looks like a sand shark, especially with how narrow and angular it is, as well as the striations. I think the coloring might help pinpoint what type of sand shark. Hope this helps. @siteseer I have been under the impression that the striations are a sign that a tooth belongs rather to Mitsukurina than to Carcharias? Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
Coco Posted November 26, 2019 Share Posted November 26, 2019 Hi, @sharko69 What means S. in "S. raphiodon" ? Scapanorhinchus ? Please write the full name when you first cite it in a subject. Not everyone knows every shark at every geological level in the world Coco 2 ---------------------- 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...
sharko69 Posted November 26, 2019 Author Share Posted November 26, 2019 39 minutes ago, Coco said: Hi, @sharko69 What means S. in "S. raphiodon" ? Scapanorhinchus ? Please write the full name when you first cite it in a subject. Not everyone knows every shark at every geological level in the world Coco Yes, sorry. Scapanorynchus raphiodon. The tooth was found in North Texas, Eagle Ford and is just over one cm in length. Link to comment Share on other sites More sharing options...
Coco Posted November 26, 2019 Share Posted November 26, 2019 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...
siteseer Posted November 29, 2019 Share Posted November 29, 2019 On 11/26/2019 at 2:08 AM, Ludwigia said: @siteseer I have been under the impression that the striations are a sign that a tooth belongs rather to Mitsukurina than to Carcharias? Hi Roger, There are species of Carcharias with lingual striations. I assumed the tooth is from the late Cretaceous of Texas, and since Mitsukurina is not known earlier than the Middle Eocene, I didn't consider that a possibility. Even if it were a possibility, I would expect Mitsukurina to have a more slender cusp relative to the height with a different root too. It is a very elusive genus in the fossil record likely due to a longtime preference for the open ocean and deepwater. Jess 1 Link to comment Share on other sites More sharing options...
Ludwigia Posted November 29, 2019 Share Posted November 29, 2019 41 minutes ago, siteseer said: Hi Roger, There are species of Carcharias with lingual striations. I assumed the tooth is from the late Cretaceous of Texas, and since Mitsukurina is not known earlier than the Middle Eocene, I didn't consider that a possibility. Even if it were a possibility, I would expect Mitsukurina to have a more slender cusp relative to the height with a different root too. It is a very elusive genus in the fossil record likely due to a longtime preference for the open ocean and deepwater. Jess Thanks for the clarification, Jess. Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
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