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  1. RAlves

    Isurus oxyrinchus

    From the album: Shark Fossil collection

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

    Mako teeth

    From the album: Shark Fossil collection

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

    Isurus (Mako Shark)

    From the album: Shark Fossil collection

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

    Isurus (Mako Shark)

    From the album: Shark Fossil collection

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

    Dagger-like teeth

    My 7 year son spotted this gem the other day. Such a beauty isn't it?
  7. 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.
  8. 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.
  9. 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?
  10. 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
  11. Ludwigia

    Cosmopolitidus hastalis (Agassiz 1843)

    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.
  12. Chase_E

    Isurus oxyrinchus

    From the album: Misc. Cenozoic Specimens

    Isurus oxyrinchus
  13. Chase_E

    Isurus oxyrinchus

    From the album: Misc. Cenozoic Specimens

    Isurus oxyrinchus
  14. ScottM

    Sharktooth Hill shortfin mako?

    Despite several visits to Sharktooth Hill and hundreds of teeth, I've yet to confirm a shortfin mako (Isurus oxyrinchus or is it Isurus desori?). Perhaps this is a possible candidate. Or maybe another C. planus or C. hastalis lower. To me, the features that make this one look different from those other common STH teeth are that it is relatively long with a narrow base/wide root, and also that little bend at the tip when viewed from the side (I think it shows up in the bottom two pics ok). It just stuck out as "something different" and I was able to eliminate a lot of other possibilities. So ma
  15. Hello to all of you, I would like to kindly as you about your opinion, because recently I have started to sort out my collection of shark teeth and I was hoping maybe here I will find someone who could help me with some ID's. I have found this shark tooth, which is not exactly small in the southern Slovakia. Age: lower miocene (Eggenburg). My guess is that it could be Isurus retroflexus, but I'm not sure. As you can see the tip was broken long time ago before I have found it. Please see the pictures attached. Any input will be welcome. Wish you a nice day. Gabriel.
  16. Jarekw20

    Possible isurus tooth

    I found this tooth last month in the Baltic Sea in Poland. After a little research I assumed it belongs to Isurus desori. The tooth is 24 mm long. Could you tell me if I’m right and how old probably this fossil is
  17. DevilDog

    Isurus Sp.?

    Is this tooth one of the Isurus species? Found on Topsail Island, North Carolina.
  18. Last week I was on holiday in the Netherlands/Belgium for a short time and I had the chance to visit the area of Antwerp to find some shark teeth. Too bad the weather wasnt good (I think it rained the entire day). Nevertheless I found some teeth and I have to say that I am kinda satisfed with the result! I almost sieved the whole day so my body still hurts a bit The material I searched in comes from the Miocene, Pliocene and was washed up from the extension of Churchill dock in Antwerp. Here are two "in-situ" pictures: A nice tooth on the sifte
  19. Our final stop in the Shark program is of course the giant Sharks of the Miocene. We wrap our adventure through the timeline of shark evolution by giving the kids what they expect to see, big shark teeth. Truthfully, we do not have many large shark teeth. I went for interesting teeth not big teeth but we have a few that will grab the kids attention. We give a very brief introduction to the giant sharks with a 2 inch Otodus tooth. We can spend too much time on Otodus or the ancestors of Megalodon as it just do not have time ( plus we do not have teeth from Auriculatus, Angustidens, or Chubutens
  20. The following content is purely based on applying a mathematical equation from Ferron (2017), who obtained it from Sambilay (1990). No other source besides a few used for length measurements have been used besides Ferron (2017). I am not a mathematician and my calculations may have mistakes, which is why I've shown all of my work in case any of you want to check my math. The formulas themselves may possibly be updated/invalidated by later studies. Please take this with the finest grain of salt. Apparently, Cretoxyrhina may possibly be the one of the, if not the fastest shark known
  21. I've recently was lucky to have found an online copy of Purdy et al. (2001)'s paper on Lee Creek sharks, and I've found a passage that caught my interest- "In morphology, the teeth lsurus hastalis (Figure 27) are almost identical to those from large individuals (TL=3.7-4.3 m) I. paucus. The tips of the upper anterior teeth of the latter species, however (TL=2.3^1.2 m, n=9), usually lack the labial recurvature that is so well developed in I. hastalis (Figure 28a). In the small number of I. paucus dentitions available to us (n=9), only one dentition (Hubbell collection, JF91980, 2.6
  22. One of my nice Lee creek mako teeth were sitting in one of my pockets with a few Hershey's chocolates with paper wrappers (don't ask why I was pretty hungry). after I ate them all, I looked at my tooth, and to my dismay saw that what looked like the ink from the wrappers had rubbed onto the root. Aside from the weird story, I have tried using a toothbrush with soap and water, to no avail. What would be the best way to get rid of the stain? I have attached before and after pics below. I know there are a few lighting differences, so I also put it aside one of my other lee creek makos that u
  23. Brett Breakin' Rocks

    Isurus desori 01

    From the album: Sharks and their prey ....

    Isurus desori Summerville, SC

    © Matthew Brett Rutland

  24. Ludwigia

    Isurus oxyrinchus (Rafinesque 1810)

    From the album: Pisces

    24mm. Shortfin Mako upper. From the Miocene at Calvert Cliffs, Maryland. Traded with Fossil-Hound.
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