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Looking for info on Temnodontosaurus eurycephalus
pachy-pleuro-whatnot-odon posted a topic in Questions & Answers
Probably one of the most enigmatic species of Temnodontosaurus is Temnodontosaurus eurycephalus, owing to only one skull ever having been found. This particular species is often described as a snub-nosed temnodontosaur with massive teeth and heavy jaw muscles that it probably used to hunt other ichthyosaurs (and other marine reptiles). Its holotype is currently held by the Natural History Museum in London, with the below being some images of it, taken off of Wikipedia: My interest with it, at present, lies with its dentition, with the morphology of its teeth. For I've seen some truly massive teeth and equally massive roots come out of Lyme Regis that I currently consider to belong to T. platyodon based on specimens labelled as such in the NHM collections (see images below for illustration, but please note that Ichthyosaurus platyodon is an old synonym for T. platyodon). And while these teeth seem morphologically similar to the teeth of Mary, Tony Gill's T. platyodon specimen (image below; source), I find myself wondering how these teeth compare to those of T. eurycephalus. Unfortunately, however, I've been able to find very little information or quality photographs on this particular species. I'd therefore like to ask if anybody here has any photographs - in particular crisp/detailed ones of the dentition - or articles (regrettably, I can't access pay-walled) that they'd be willing to share. Thanks in advance!- 6 replies
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From the album: Post Oak Creek
Reconstructed tooth set from a "Crow" shark - Squalicorax (could be S. falcatus) - illustrating the variety of tooth positions. Anterior teeth have erect, triangular cusps. Lateral teeth and posteriors are more common and have an increasingly posteriorly slanted crown, resembling the teeth of modern tiger sharks.-
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Associated Cretoxyrhina (vraconensis) dentition
britishcanuk posted a topic in General Fossil Discussion
Hi, Recently, I had the good fortune to acquire this set of Cretoxyrhina (vraconensis) teeth from the Britton Fm., Texas. I have a detailed account of it’s discovery which describes almost all of these teeth being found together in an area about 18” x18”, with a few stragglers found just outside the main pile of teeth. It’s not complete, but It looks like most of the positions are represented. Some of the larger anteriors were not recovered and I suspect at least one or two positions are missing. I have arranged these teeth into positions that look close to me, but there is no doubt that it needs to be adjusted. I am hoping someone here might know something about these early Cretoxyrhina dentitions and might be able to advise or comment on how I can make this accurate. Some other noteworthy finds recovered from the same 18” square were 2 suspected Cretoxyrhina vertebrae, 5 small Squalicorax (falcatus) teeth, a possible Archeolamna tooth, another very small unidentified cusped shark tooth, and some small fish vertebrae and bones. Thanks for looking. R~- 7 replies
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Looking for Paleocene/Eocene shark dentition resources
bthemoose posted a topic in General Fossil Discussion
Hi all, I'm looking for photos or good illustrations of dentitions from a few different sharks from the Paleocene and Eocene to help improve my recognition and to learn better how their teeth varied across the jaw. These could be natural/associated sets or artificial/constructed ones. The sharks I'm looking for are: Jaekelotodus robustus Palaeohypotodus rutoti Brachycarcharias lerichei Isurolamna inflata Can anyone point me toward resources for any of these? If you know of dentitions from different species within these genera, those would be helpful as well. Thanks!- 4 replies
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I found this front bit of carnivore jaw while out on my latest fossil collecting trip in the White River Formation of Colorado. Only one tooth is complete, the canine tooth has broken off. It’s too large to be Hesperocyon and the cross section of the canine tooth does not match that of Daphoenus, which I have previously collected material, including a canine tooth, from. That leaves Hyaenodon and the Nimravids. After doing some comparative research with pictures of skulls, I am tentatively leaning towards this being from a Nimravid, as the contours of the jaw line near the socket where the canine tooth sits are fairly distinctive and match those in the pictures of Nimravid skulls almost perfectly, less so than the contours seen in the skull of Hyaenodon horridus. Plus, the canine tooth is triangular in cross section, and though I couldn’t find any specific references on this bit of anatomy that makes more sense to me for the stabbing canines of a Nimravid rather than the flatter canines of Hyaenodon. But alas, here I am to get other opinions. Hyaenodon or Nimravid? Or something else entirely? (I am fairly confident this isn’t just a piece of oreodont jaw, haha). Thanks in advance.
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A friend found this on a gravel bar in Southern Minnesota. It definitely looks like horse but it is quite large. 4" x 1 5/8". I couldn't find any good size references for horse molars online. If horse are these dimensions outside the normal range?
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Differentiating between Oreodont and camel jaws/teeth
Opabinia Blues posted a topic in General Fossil Discussion
Hello! Does anyone know of any good references for differentiating between Oreodont and camel dentition, particularly in regards to the little jaw sections that are frequently found in White River deposits? I’ve been unable to find any good literature on the topic and am having some difficulty with differentiating between the two. -
Early Cretoxyrhina (vraconensis) dentition question
britishcanuk posted a topic in General Fossil Discussion
I’m wondering if anyone has put together a dentition of an early Cretoxyrhina with narrow lower teeth and cusped laterals and posteriors. If you have photos of something like this I would very much appreciate seeing what one looks like. Thanks in advance! R~- 5 replies
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Quite some years back my late uncle purchased the attached fossil at a gem show here locally. Too be completely honest it looks kind of fake to me... but im might just have a untrained eye. My Aunt has taken the picture. I Couldn't possibly imagine it being from around here so I'm really not sure what age it could be or what location it is from. I'll try to acquire some more photos with a scale shortly. I know its a shot in the dark but any feedback would be greatly appreciated. -Nick
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Hi guys! I just uploaded a gallery of modern Carcharhinus upper dentitions: . The images are from my master's thesis (Smith 2015), the full text is available at (https://www.researchgate.net/publication/316735477_Species_discrimination_in_Carcharhinus_shark_teeth_using_elliptic_Fourier_analysis). Unfortunately, due to file size limitations, the images in the paper are not really good enough for detailed analysis of the morphology. So I have uploaded them individually here. I personally extracted the teeth from almost all of these jaws...If I remember correctly, they were soaked in isopropyl alcohol for several days and then the teeth removed with toothpicks and/or just pulling them out with my fingers. I cut up my fingers too many times to count trying to get these suckers out! Only the upper dentition is included; the bottom teeth in Carcharhinus are very same-y so we just focused on the uppers. Keep in mind, these represent only twelve species out of over thirty described species. They are biased towards species today present in the Western Atlantic/Gulf of Mexico. Five species now present in the Western Atlantic/Gulf of Mexico were not included due to lack of specimens/time: C. altimus, C. galapagensis, C. perezi, C. porosus, and C. signatus. Other Carcharhinus dentitions are available on the net. J-elasmo has some, I believe mostly collected from near Japan: http://naka.na.coocan.jp/JAWCarcharhinidae.html. They generally match well with my dentitions, although their Silky (C. falciformis) dentition is more coarsely serrated at the tips than mine, and the lateral notch, which is prominent in my specimens, is basically absent in the J-elasmo dentition. And of course there is Elasmo.com, a great resource for all sharks, not just Carcharhinus. Their C. falciformis dentition is similar to mine, so I don't know what's going on with J-elasmo's dentition, either it's mislabeled or Silky teeth look a lot different in the western Pacific. Or it's just an unusual specimen. And of course there are a bunch of papers online with Carcharhinus teeth, although these are generally isolated fossil teeth. The single best resource I could find for Carcharhinus identication based on teeth is unfortunately difficult to obtain, and would probably require an interlibrary loan request: Garrick, J. A. F. (1982). Sharks of the genus Carcharhinus. US Dep. Commer. NOAA Tech. Rep. NMFS Circular, 445, 194. His shark teeth images are illustrations, but well done, and with a lot of descriptive information. Purdy et al. (2001) is also a good reference:(https://www.researchgate.net/publication/284595551_The_Neogene_sharks_rays_and_bony_fishes_from_Lee_Creek_Mine_Aurora_North_Carolina). You can find references to several papers related to fossil Carcharhinus, as well as a general overview of their fossil record, in my thesis. Finally, I'm attaching a figure from my thesis, illustrating the morphological terminology used: C. falciformis, upper right jaw, 5th position from symphysis. Feel free to add additional references or information about the genus Carcharhinus. Or if anything is incorrect in this post. The subject of fossil Carcharhinus tooth identification comes up fairly regularly in the forums, so let's try and stick as much information in here as possible!
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Found at Myrtle Beach South Carolina, thought it might be some kind of ray tooth plating but it doesn't match any of the ray stuff I have, any ideas? One picture has the ray teeth I'm familiar with to the left of unknown piece.
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Intermediate and Symphyseal/Parasymphyseal teeth in sharks
The Jersey Devil posted a topic in General Fossil Discussion
Hey everyone, I was just wondering what exactly intermediate teeth were and also what the difference between symphyseal and parasymphyseal teeth is. The small fourth tooth in the upper jaw of Carcharias taurus is marked as an intermediate. Thanks for any help!- 3 replies
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My attempt at a one row megalodon and great white jaw
mattbsharks posted a topic in General Fossil Discussion
This is my attempt at arranging the teeth. I thought it would be fun to try. I have no idea how to construct the actual jaw or how to do proper dentition. Dog provided for reference. The photos were too large to post so here are the links: https://drive.google.com/file/d/0B7QcbeYzTMs6MnBNbnlfcTJPcFk/view?usp=sharing https://drive.google.com/file/d/0B7QcbeYzTMs6cFVDbVBaclBaanM/view?usp=sharing https://drive.google.com/file/d/0B7QcbeYzTMs6VVNWdkVBNGVpMzQ/view?usp=sharing https://drive.google.com/file/d/0B7QcbeYzTMs6NnJTMldiT08wbEk/view?usp=sharing https://drive.google.com/file/d/0B7QcbeYzTMs6Q3h2cGhwTVN2VFk/view?usp=sharing https://drive.google.com/file/d/0B7QcbeYzTMs6QWhPc2ROX1JRT1U/view?usp=sharing- 27 replies
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Wondering if this megalodon tooth could have come from a world class megalodon shark
mattbsharks posted a topic in Questions & Answers
I recently acquired this megalodon tooth. It would have measured about 5.9 inches on the slant if the tip was intact, and measures 5.1 inches across. This question is for all you shark tooth dentition experts out there. I have never come across a megalodon tooth this big that appears to be a posterior which leads me to my first question, is it possible that this tooth came from a world class size megalodon with 7 inch teeth? I was also wondering what differentiates a megalodon from a chubutensis. I know that chubs have cusps, but it seems rather ambiguous to me with some megs appearing to have cusps or dips at the end of the blades. Thanks, Matt