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  1. ThePhysicist

    Pectinodon tooth

    From the album: Hell Creek / Lance Formations

    Pectinodon (meaning "comb-tooth") is a tooth taxon, since no remains attributable to the genus beyond teeth have been found. Pectinodon seems to be a rare member of the Hell Creek fauna, with their teeth being fairly uncommon (though being so small, I'd guess that few people actively search for them). It was a small Troodontid theropod, with teeth that couldn't handle stresses as well as their Dromaeosaurid and Tyrannosaurid cousins (Torices et al. (2018)). This coupled with their small size suggest that Pectinodon was a small/soft prey specialist, preferring the rodent-sized mammals of the ti
  2. ThePhysicist

    Judithian Theropod

    From the album: Dinosaurs

    A theropod tooth I recently acquired from the JRF. Sold as a juvenile Tyrannosaurid, but I'm not fully convinced.
  3. Dino Dad 81

    Acheroraptor 2nd premax

    @Troodon I suppose this is the one-decade-later version of the same tooth I posted earlier? Hell Creek formation, Garfield co, Montana CH: 12.7mm CBL: 7.2mm CBW: 3.5mm Mesial serration density: 8/mm Distal serration density: about 4/mm Thanks!
  4. Dino Dad 81

    Saurornithelestes 2nd premax?

    This reminds me of those specialized Acheroraptor premax 2 teeth (for preening?). I'm never seen one for Saurornithelestes, but I suspect that's what this is. I don't know if Dromaeosaurus has anything like this. Judith River formation, Hill co, Montana CH: 7.3mm (I added 0.3mm for tip wear) CBL: 4.8mm CBW: 2.3mm Mesial serration density: 4.8/mm Distal serration density: about 9.5/mm
  5. Dino Dad 81

    Nanotyrannus or Dakotaraptor?

    Hey all, What do you think of this one? Hell Creek formation, Powder River co, Montana CH: 10.9mm CBL: 6.6mm CBW: 2.9mm Mesial serration density: about 4.8/mm Distal serration density: about 4.0/mm Distal serrations are pretty worn except those near the tip, which look fairly chisel, but have an apical hook(?) Thanks!
  6. Hi All, I'm new to this forum and thought I'd send over images of my theropod teeth plus one extremely impressive sauropod from Madagascar. Hope you like them! Paul
  7. Kikokuryu

    Tiny Judith River Theropod Teeth

    These teeth were sold as a baby tyrannosaurid and a dromaeosaurid/bird respectively. Some other specimens from this lot have been posted here if I recall. But they are from North of Havre, Montana close to the Canadian border. Apparently they are from quite an old collection from around 1950-70s. The provenance should place it solidly in Judith River Formation. Since these teeth were selling somewhat quickly, I just grabbed them and decided on figuring it out later. The first tyrannosaurid tooth does have some similarities to Dromaeosaurus with the mesial twist, but I could be wron
  8. ThePhysicist

    Coelophysoid? Theropod tooth

    From the album: Triassic

    From the "dawn" of the Dinosaurs, this small tooth represents an early theropod. Unlike the other serrated archosauriform teeth present in the formation, this tooth is ziphodont - thin and labio-lingually compresed - the archetypical tooth form that most theropods adhered to since their beginnings.
  9. Per Christian

    Feeding wear or erosion?

    So I've got this theropod indet tooth that's from the elrhaz formation, or so the seller claims anyway. The tip is missing and I'm wondering if it's due to feeding wear or erosion? The tooth seems to have been quite worn by the owner, the distal carinae is almost worn away, but i suspect it's also eroded some. The angle of the break makes me think it's feeding wear, but il not certain. Any help is appreciated! @Troodon @pachy-pleuro-whatnot-odon
  10. Dino Dad 81

    Theropod bone

    Hello, Any thoughts on what animal this bone comes from? Judith River Formation, North of Havre, MT close to the Canadian border About 1" long Thanks,
  11. musicnfossils

    Theropod Bone

    Can’t figure this one out. Maybe a limb bone but definitely theropod. Dinosaur park formation
  12. musicnfossils

    Possible claw?

    Hey all, I found something similar to a claw today and I’m wondering if there’s a possibility. Maybe a foot claw if it is but I don’t know what it could be. There’s quite a bit of ironstone on it so it’s hard to say. Dinosaur park formation.
  13. Dino Dad 81

    Dakotaraptor premax/anterior?

    This has the size and J-shape cross section of a dromie premax. It also has the protruding mesial carina that you can see from a distal view. What do you think? Hell creek formation, Carter co, Montana CH: 15.6mm CBL: 6.7mm CBW: 4.7mm Mesial serration density: 6.5/mm Distal serration density: 3.5/mm
  14. Dino Dad 81

    Another Dromaeosaurid premax/anterior?

    This has the size and J-shape cross section of a dromie premax. It also has the protruding mesial carina that you can see from a distal view. What do you think? Hell creek formation, Powder River co, Montana CH: 14.8mm CBL: 7.0mm CBW: 5.3mm Mesial serration density: 4.66/mm Distal serration density: 3.20/mm Thanks!!
  15. ThePhysicist

    Pectinodon tooth

    From the album: Hell Creek / Lance Formations

    Pectinodon (meaning "comb-tooth") is a tooth taxon, since no remains attributable to the genus beyond teeth have been found. Pectinodon seems to be a rare member of the Hell Creek fauna, with their teeth being fairly uncommon (though being so small, I'd guess that few people actively search for them). It was a small Troodontid theropod, with teeth that couldn't handle stresses as well as their Dromaeosaurid and Tyrannosaurid cousins (Torices et al. (2018)). This coupled with their small size suggest that Pectinodon was a small/soft prey specialist, preferring the rodent-sized mammals of the ti
  16. ThePhysicist

    Paravians of Hell Creek

    From the album: Hell Creek / Lance Formations

    Even in the final years of the non-avian dinosaurs, the paravians remained diverse, with many species represented in the famed Hell Creek formation.
  17. Dino Dad 81

    Theropod Tooth

    Would love to hear what do you think of this one? Hell creek formation, Carter co, Montana CH: 11mm CBL: 5.8mm CBW: 2.6mm Mesial serration density: about 5.3/mm Distal serration density: about 4.3/mm Thanks!
  18. Hi, i found this fossil for sale and i'm curious is it real, how much original bone is present and has the picture been edited?
  19. Dino Dad 81

    T Rex tooth?

    Hi, Looks like Rex to me. Hell creek formation, Powder River co, Montana CH: 22mm CBL: 11.1mm CBW: 6.3mm Mesial serration density: 15/5mm Distal serration density: 14/5mm
  20. Dino Dad 81

    Another theropod tooth

    Hi, What do you think? Hell creek formation, Harding Co, South Dakota CH: 13.4mm CBL: 7.3mm CBW: 3.0mm Mesial serration density: about 5.5/mm Distal serration density: about 4.4/mm
  21. Dino Dad 81

    Theropod Tooth

    Hi, Not sure this is identifiable. Rex? Possible huge raptor indet? Hell creek formation, Garfield co, Montana CH: about 27mm CBL: 11.1mm CBW: 6.2mm Mesial serration density: about 3.4/mm Distal serration density: about 2.6/mm
  22. Dino Dad 81

    Dakotaraptor or Nanotyrannus

    Hi, What do you think? Hell creek formation, Powder River co, Montana CH: 11.2mm CBL: 5.9mm CBW: 2.9mm Mesial serration density: about 7/mm Distal serration density: about 4.3/mm Thanks!
  23. Dino Dad 81

    Theropod Tooth -- Tiouraren fm

    Hey all, Curious to get your thoughts on a new addition: Tiourarén formation, Niger CH: 35mm (very rough estimate) CBL: 19.2mm CBW: 9.7mm Mesial serration density: 1.5/mm Distal serration density: 1.6/mm Transverse undulations present Mesial carina extend to approximately 2/3 down
  24. Hi everyone! I recently acquired this from the Hell Creek of Carter County. I assumed it was a juvie Rex and but was asked to check the serration density and it came back weird so I thought I'd ask for some input. I'm hoping I can at least rule out Nano which I will be shocked if this even has the possibility of being Nano. We might be looking at another "Larsonraptor" situation (if you know you know). CH is 26 mm CBL is 11 mm CBW is 8.18 mm mesial serration density is 14 for 4 mm distal serration density is 10.5 for 4 mm DSDI is 4/3 Any insight i
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