DevilDog Posted August 8, 2019 Share Posted August 8, 2019 I like to have extant teeth in my collection to contrast with fossil teeth of the same or similar species. I bought these teeth at a tourist shop in Las Vegas a few years ago. They had been made into necklaces. I thought they might be H. elongata based on the root shape and would be interesting to display along with my fossil H. serra teeth. I am not convinced my ID is correct, especially considering the serrations go all the way to the tip. Any ideas? Link to comment Share on other sites More sharing options...
hemipristis Posted August 8, 2019 Share Posted August 8, 2019 I believe that they are from the blue shark, Prionace glauca. Photo courtesy of theSmithsonian below. 1 'Those who cannot remember the past are condemned to repeat it.' George Santayana Link to comment Share on other sites More sharing options...
Coco Posted August 8, 2019 Share Posted August 8, 2019 Hi, I’m leaning more towards Hemipristis elongata. Look at the middle of the root : in Hemipristis elongata the center of the root is particularly "square" whereas this isn't the case in Prionace glauca. 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...
hemipristis Posted August 9, 2019 Share Posted August 9, 2019 6 hours ago, Coco said: Hi, I’m leaning more towards Hemipristis elongata. Look at the middle of the root : in Hemipristis elongata the center of the root is particularly "square" whereas this isn't the case in Prionace glauca. Coco Note that in the upper photo one is viewing the lingual side of the teeth while in the lower photo one is viewing the labial side 'Those who cannot remember the past are condemned to repeat it.' George Santayana Link to comment Share on other sites More sharing options...
Coco Posted August 9, 2019 Share Posted August 9, 2019 Hi, I know, I’ve seen ! But on both sides we can see this square shape... Do you prefer this one ? On the other two teeth it is also seen but less clearly. It must be said that white teeth on a white background don't make this reality visible. And here is my two jaws to compare @MarcoSr 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...
Al Dente Posted August 9, 2019 Share Posted August 9, 2019 It looks like Prionace to me. On Prionace teeth there are fine serrations all the way to the tip while Hemipristis have coarse serrations along the edges but no serrations on the tips. Link to comment Share on other sites More sharing options...
hemipristis Posted August 9, 2019 Share Posted August 9, 2019 Top photo is from the U.S. National Oceanogrphic and Atmospheric Administration Fisheries website. The second is from Fisheries and Oceans Canada. Both photos of Prionace glauca teeth seem to show the squarish notch. https://www.nefsc.noaa.gov/rcb/photogallery/shark_teeth.html https://www.dfo-mpo.gc.ca/species-especes/profiles-profils/blueshark-requinbleu-eng.html 'Those who cannot remember the past are condemned to repeat it.' George Santayana Link to comment Share on other sites More sharing options...
MarcoSr Posted August 9, 2019 Share Posted August 9, 2019 12 hours ago, Coco said: @MarcoSr Coco 11 hours ago, Al Dente said: It looks like Prionace to me. On Prionace teeth there are fine serrations all the way to the tip while Hemipristis have coarse serrations along the edges but no serrations on the tips. The teeth posted above by @DevilDog are upper Prionance glauca teeth. Although the upper teeth of Prionace and Hemipristis do look similar there are multiple features which do help tell them apart. Eric is 100% correct on what he says above about the serrations. Upper Prionace teeth also have very prominent nutrient groves with a very prominent notch like the teeth in this post and Hemipristis do not. The upper teeth of Prionace and Hemipristis also have different shaped roots which are difficult for me to describe but can be seen in the below dentitions from J-elasmo. I could post pictures of teeth from the modern jaws that I have, but I believe the below pictures are better because you can clearly see the roots of the teeth and the nutrient grooves. You also can adequately see the serration differences. Hemipristis elongatus (Snaggletooth Shark) dentitions: Prionace glauca (Blue Shark) dentition: Marco Sr. 3 "Any day that you can fossil hunt is a great day." My family fossil website Some Of My Shark, Ray, Fish And Other Micros My Extant Shark Jaw Collection Link to comment Share on other sites More sharing options...
Coco Posted August 9, 2019 Share Posted August 9, 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...
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