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  1. I need help with a couple of ID's.... The first one is a shark tooth, from the east coast of the USA - most likely from the Meg ledge. I'm not sure if it's a Carcharodon or Isurus tooth. The root shape looks more Isurus-ish but I'm not 100% which is why I'm asking here. The other one is an awesome Mosasaur tooth in matrix (Moroccan in origin, if that wasn't obvious haha)... does anyone know the genus of this tooth? It doesn't look like the typical Prognathodon teeth often seen in natural matrix. The other fossils within this matrix have me very curious too.... can anyone ID the shark tooth and other random fossils? There is a good size chunk of bone in there too. The hourglass(ish) shaped fossil might be a vertebra ...?
  2. Pulled out this interesting tooth from possum creek. It's been identified as Isurus retroflexus and I'm wondering if anybody here has seen similar examples from Gainesville. I haven't heard of any. Next steps: find a great white, sand tiger, and cow shark tooth!
  3. Sonickmonx

    Fire and Ice Desori

    From the album: Sonickmonx's South Carolina Finds

    This isn't an especially impressive specimen, but it has extremely beautiful and unusual colors.
  4. My understanding is that lower teeth for Carcharodon hastalis differ from Isurus Oxyrinchus in that the Isurus crown is slenderer than Carcharodon. What are some of the other distinguishing differences? Is the image of a Carcharodon hastalis or Isurus Oxyrinchus fossil?
  5. Fin Lover

    Did I misidentify this shark tooth?

    I definitely don't want to incorrectly ID something in the CRM. This one has been questioned, so I'd love your thoughts! Thank you!
  6. ThePhysicist

    Macrorhizodus praecursor

    From the album: Sharks

    An early Lamnid (family that includes the modern great white and mako sharks) from Central Kazakhstan. Some consider this genus to be ancestral to Carcharodon or both Carcharodon and Isurus. The latter is a tempting hypothesis since molecular clock studies place the last common ancestor of the great white and makos in this time.
  7. Thomas1982

    Isurus hastalis

    From the album: Florida Vertebrates

    Isurus hastalis Sarasota County, Florida
  8. Hastalis

    Isurus retroflexus?

    Hello, I have found this tooth last year in Lučenec region, southern Slovakia. Age: lower Miocene/Eggenburgian (Central Paratethys). Scale is in cm. It looks like Isurus retroflexus tooth, but I want to be 100% about it. If it is the one, I can finaly add the first of this kind to my collection. Thank you in advance.
  9. I recently found this large 2.5 inch Isurus desori tooth and it got me thinking… what is the largest Isurus desori/oxyrinchus tooth out there? Feel free to post some large ones!
  10. ThePhysicist

    Mako juxtaposition

    From the album: Sharks

    The Mako tooth design hasn't changed much in ~ 30 million years. The left tooth is the modern species I. oxyrinchus, the right one is I. desori (from Charleston, SC, 2 1/8" slant, Oligocene). Some would say that I. desori is the same as the modern species.
  11. Bails

    A. grandis or Isurus?

    Hi all, I found a couple tooth today on morning hunt in Charleston, SC. I am fairly certain the first tooth (in the first two pictures) is A. grandis. However, I am unsure if the second tooth (in the last two pictures) is A. grandis, alopias sp., or isurus. I had this discussion with @MarcoSr in another thread but they resemble each other so much I still can’t tell with my eye. happy to post additional pictures if needed and thanks in advance!!
  12. Hey all, I wanted to share a large Isurus desori tooth I found this weekend in Charleston, SC. It measures just over 2 1/4 inches and is the biggest I have personally found!
  13. Taxonomic debate over extinct lamniformes remains a big thing, but I've noticed that it seems like there hasn't been any studies that use modern phylogenetic techniques (i.e. maximum parsimony) to resolve issues with extinct taxa (i.e. Carcharodon, Isurus, Macrorhizodus, Otodus). Is there a reason for this absence, or perhaps I simply have not come across one that already exists? I suppose it's possible that dental characteristics alone as character codes for a phylogenetic matrix may not be viable...
  14. RAlves

    Isurus oxyrinchus

    From the album: Shark Fossil collection

    Isurus oxyrinchus (shortfin mako) teeth from the Portuguese miocene
  15. RAlves

    Mako teeth

    From the album: Shark Fossil collection

    I. paucus or I. hastalis? from the Portuguese Miocene
  16. Are Isurus praecursor and Macrorhizodus praecursor synonyms? I have conflicting accounts on this and would like clarification please. Thank you, Bellamy
  17. RAlves

    Isurus (Mako Shark)

    From the album: Shark Fossil collection

    Isurus (Mako Shark) from the Miocene, Portugal
  18. RAlves

    Isurus (Mako Shark)

    From the album: Shark Fossil collection

    Isurus (Mako Shark) from the Miocene, Portugal
  19. RAlves

    Dagger-like teeth

    My 7 year son spotted this gem the other day. Such a beauty isn't it?
  20. Praefectus

    Aurora Shark Tooth ID Help

    Hello. I found this tooth about a year and a half ago in the spoil piles outside the Aurora Fossil Museum. I was wondering if anyone could help me identify it? I think it might be a mako tooth (Isurus oxyrinchus?). Also, does anyone know why one side of the root is much smaller than the other? Is that damage? Or maybe due to jaw position? Thanks for your help.
  21. Hastalis

    Isurus retroflexus tooth?

    Hello, this tooth was found in Lučenec region, southern Slovakia. Age: Eggenburgian (Central Paratethys): about 20.8 – 18.3 mil years old. Scale is in cm. Although there is nothing left out of the root, the crown is still very nicely preserved. Comparing to its size, the crown is really broad and flat. Could this be the Isurus retroflexus tooth (maybe the broad form) ? Haven't been lucky with these so far.
  22. Hastalis

    Isurus desori tooth?

    I have a little doubt about this one here. I have found this piece in Lučenec region, southern Slovakia. Age: Eggenburgian (Central Paratethys): so about 20.8 – 18.3 mil old. Scale is in cm. The tooth is lightly curved without any serrations. After some observations of the root and the transitional area between the tooth and the root I have ended up with conclusion, that this should be Isurus desori aka Isurus oxyrinchus tooth. What do you think?
  23. Ludwigia

    Carcharodon hastalis

    From the album: Pisces

    Whatever it's called, Carcharodon, Cosmopoltidus or Isurus, it has a slant length of 25mm. Burdigalian OMM Early Miocene From Billafingen, Germany
  24. From the album: Pisces

    2cm. Or Carcharodon hastalis. Or Isurus hastalis. Whatever.... Burdigalian, Miocene. Found at Billafingen, Baden-Wuerttemberg, Germany. Genus to "Isurus" hastalis is still being debated. Some call it Carcharocles.
  25. Miocene_Mason

    Isurus retroflexus

    Found between Plum Point and Parker’s Creek. It is an upper anterior. Isurus retroflexus may be conspecific with Isurus paucus. Not found in situ.
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