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  1. ThePhysicist

    Dimetrodon Tooth

    Identification: This tooth was found in processed microfossil matrix from Waurika, OK, USA. Reptile remains in general are very uncommon, so if you think you've found many pieces of Dimetrodon teeth, you're likely mistaking many Orthacanth shark cusps. Orthacanth shark enamel is smooth, and the serrations are quite prominent compared to those on Dimetrodon which are finer. Dimetrodon enamel is not smooth, as seen on this one. Dimetrodon crowns are also broader. Shark cusps broken at the foot of the crown also flare out, where reptile teeth do not. Were this crown complete, you would also not
  2. ThePhysicist

    Lungfish tooth

    From the album: Permian

    Ornamented lungfish bone/scales are fairly common, but their teeth seem to be comparatively rare. This one is ~ 3 mm in its longest dimension. ^Mottequin et al. (2015)
  3. ThePhysicist

    cf. Dimetrodon grandis

    From the album: Permian

    Now how can this crumb of a tooth be attributed to Dimetrodon?? First, it's serrated. It could be shark? The enamel is not smooth (not very visible in this image, a little at the bottom), so no (additionally, the serration shape is different from those of Orthacanth sharks). That narrows it down to serrated Synapsids. It turns out that very few animals at this time and location had "true" serrations, not just enamel serrations, but bumps in the dentine beneath the enamel. The enamel on this piece happens to still be clear, allowing one to see the globular dentine underneath! From B
  4. ThePhysicist

    Labyrinthodont tooth structure

    From the album: Permian

    A "lucky break" in a Labyrinthodont tooth (likely Temnospondyl amphibian) still embedded in matrix reveals the intricate labyrinth of plicidentine.
  5. ThePhysicist

    Dimetrodon tooth

    From the album: Permian

    Dimetrodon sp. Wellington/Ryan Fm., Waurika, OK, USA Post-canine/posterior tooth This tooth is likely from D. limbatus, given the locality and presence of serrations: https://www.nature.com/articles/ncomms4269 The same paper also rules out other serrated Sphenacodonts by the enamel ornamentation. Its smaller size could indicate that it's from a juvenile. It differs from the comparatively abundant broken Orthacanth shark tooth cusps in the microfossil matrix (what most people are likely to confuse with): the enamel texture is not smooth, the c
  6. ThePhysicist

    Hatchling Dimetrodon Claw?

    Hi y'all. Found this in some Permian micromatrix from Waurika, OK. There's no way I'm this lucky, but is this a very tiny Dimetrodon claw? I've tried to get access to this paper, but still waiting to see if the authors will send the text. I'm fairly confident it's at least sphenacodontid, based on pictures I've seen on the forum. It's about 3 mm in length. @dinodigger@jdp
  7. ThePhysicist

    Developing Orthacanth shark tooth?

    From the album: Permian

    This may be a pathology, or a tooth in development?
  8. ThePhysicist

    Permian microfossils

    From the album: Permian

    These are virtually all the microfossils I found in two small bags of medium-grain matrix from Waurika, OK. The matrix was very fossil rich. The vast majority of the fossils are Xenacanth/Orthacanth shark teeth. Fish material is next most common, then amphibian, and lastly, identifiable reptile material is very rare.
  9. ThePhysicist

    Barbclabornia leuderensis (2)

    From the album: Permian

    Small teeth (only a couple of mm tall) from what could've been a 10'-15' shark.
  10. ThePhysicist

    Labyrinthodont tooth cross section

    From the album: Permian

    A serendipitous natural break in a labyrinthodont tooth nicely displays the enamel in-foldings which give this class of amphibians their name. ^https://aaronrhleblanc.wordpress.com/2019/04/23/dental-origami-the-elegant-shapes-of-folded-dentine/
  11. ThePhysicist

    Orthacanth shark teeth

    From the album: Permian

    "Eel" shark teeth.
  12. ThePhysicist

    Dimetrodon spine

    From the album: Permian

    Spine section from Dimetrodon sp. (limbatus?).
  13. ThePhysicist

    Amphibian teeth

    From the album: Permian

    These could be Eryops, but really can't say.
  14. ThePhysicist

    Sarcopterygian fish teeth

    From the album: Permian

    Lobe-finned fish teeth, our close relatives.
  15. ThePhysicist

    Orthacanthus platypterygius

    From the album: Permian

    Freshwater "eel" shark teeth.
  16. ThePhysicist

    Progyrolepis sp. tooth base

    From the album: Permian

    These teeth are commonly associated with labyrinthodonts, but the base clearly doesn't support that.
  17. ThePhysicist

    Progyrolepis sp. fish teeth

    From the album: Permian

  18. ThePhysicist

    Helodus sp.

    From the album: Permian

    Freshwater shark teeth.
  19. ThePhysicist

    Orthacanth shark denticles and spines

    From the album: Permian

    These sharks would not be fun to pet.
  20. ThePhysicist

    Shark cartilage

    From the album: Permian

    This cartilage closely resembles that of modern sharks.
  21. ThePhysicist

    Barbclabornia luederensis

    From the album: Permian

    Small freshwater shark teeth.
  22. ThePhysicist

    Fish scales and spines

    From the album: Permian

    Palaeoniscoid and Actinopterygian fish scales and spines.
  23. ThePhysicist

    Permian fossils

    Hey y'all! Need help with some Permian material. 1. Thought it was Xenacanth shark, but it looks odd to me (~ 3 mm): 2. Think it's a fish spine (~ 3 mm): 3. No idea; a tooth of some kind (~ 1 mm):
  24. Hi everyone I think I just found a new hobby With my latest fossil delivery I recieved quite a lot of microfossils & matrix vials as the world of microfossils was something that I have been long interested in. So a 2 weeks ago I finally ordered my first microfossils for which I reserved a special drawer in my archive cabinet. So here is a recapp of what I all got: 3 vials of permian material from Waurika, Oklahoma 1 vial of permian material from The red beds of Archer County, Texas 1 small vial of Conodont rich Mississippian material from the Chappel Limestone fo
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