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From the album: Dunkleosteus terrelli partial skull
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Unusual find of putative Placoderm Fossil at Penn Dixie
Biotalker posted a topic in General Fossil Discussion
At the “Dig with the Experts” earlier this month at Penn Dixie, I found this interesting surface fossil on a block that the on location experts seemed to agree was a placoderm fossil. Approximately 5 inches (12.5cm), it is thin, pigmented and has intermittent perforations or pustules. In an adjacent pile, another more extensive and remarkable set of fossil strips like this presumptive placoderm were found by another rock buster. Anecdotally, it was remarked by staff that these two putative placoderm blocks were excavated from the “same region” of the pit as the apparent Dunkleosteus jaw discovery. Perhaps just a coincidence, but nonetheless an interesting mystery.
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Ahoi, I just finished a model of Dunkleosteus the lazy way, because I don´t have that much time these days. Lazy way means: Skull is a bought model from kaiyodo dinotales, postcranial is a skeletal drawing by Scott Hartmann I modified slightly and printed on some transparent foil. Like the outcome. It is quite small though, only 15 cm, representing a meager 3m in my chosen scale. can anyone tell what the other two are? both recent species, one handmade after a photograph, the other 3d printed from ct data. As I don´t know if I can add tags after posting , I just added the ones I may put in this thread if I ever find the time to build them. After all my Whales, other marine Mammals , Birds and Reptiles I thought it would be nice if I could include some more Reptiles and "Amphibians" (?) If it crossed the border between land and sea, its likeness shall be built by me -some day. -Placodus -Cyamodus -Mastodonsaurus -Tiktaalik -Ichthyostega -Diplocaulus Aloha, J
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Wolf Run Preserve along the Vermilion River may well harbor fossils of the fearsome Dunkleosteus (photo gallery) Peter Krouse, ClevelandCom, February. 07, 2022 More about Dunkleosteus: A Devonian Fish Tale: A New Method of Body Length Estimation Suggests Much Smaller Sizes for Dunkleosteus terrelli (Placodermi: Arthrodira) Diversity 15(3):318, February 2023 Paleobiology of Dunkleosteus terrelli and Paleoecology of the Cleveland Shale Yours, Paul H.
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Holy grail Dunkleosteus terrelli partial skull for my collection
Pliosaur posted a topic in Member Collections
Hello everyone! I wanted to share a holy grail fossil that I have obtained: a partial skull of Dunkleosteus terrelli found in Cleveland Shale, Ohio This specimen has been confirmed by Zerina Johnson, a leading paleontologist at the Natural History Museum of UK as well as James Boyle who is a leading expert in the field and published academic research papers on Dunkleosteus and other placoderms of the Devonian period. Below is an excerpt from James Boyle on the Dunkleosteus partial skull specimen: "Yes, it's most like a Dunkleosteus based on what I can see. You have both anterior dorsal lateral plates of the thoracic armor there. These are the bones that connected with a mobile joint the head and shoulder regions of the armor. The bone to the bottom left is the internal view of the left anterior dorsal lateral plate. The bone under it is the right anterior dorsal lateral plate in external view. The piece that's skewed to the right a bit in the image is part of the left anterior dorsal lateral plate as well. The easiest way to identify which of the two plates is the external (from the outside) view is that there's a sensory line canal on the one plate (it's straight nearly straight line tracing across the one bone at the top). These are the lateral line system you can still see in some modern fishes and act as pressure sensors to detect movement in the water around the organism. They are only found on the outside of the body." "That oblong bone at the top is probably a piece of the paranuchal plate, but if that's the case it's only a very small fraction of it." Johanson Z (null) Vertebrate cranial evolution: Contributions and conflict from the fossil record. Evolution & Development, doi: 10.1111/ede.12422 Lebedev OA, Johanson Z, Kuznetsov AN, Tsessarsky A, Trinajstic K, Isakhodzayev FB (null) Feeding in the Devonian antiarch placoderm fishes: a study based upon morphofunctional analysis of jaws. Journal of Paleontology, 1 - 18. doi: 10.1017/jpa.2022.54 Charest F, Johanson Z, Cloutier R (2022) The preorbital depression and recess of antiarch placoderms (jawed stem-gnathostomes) revisited from an ontogenetic (saltatory) point of view. Journal of Vertebrate Paleontology, 42 (1) : doi: 10.1080/02724634.2022.2116335 Johanson Z (2021) Paleontology: There are more placoderms in the sea. Current Biology, 31 (16) : R1012 - R1014. doi: 10.1016/j.cub.2021.06.073 van Mesdag SNK, den Blaauwen J, Dean MN, Johanson Z (2020) Hyperossification in the vertebral column of Devonian placoderm fishes (Arthrodira). Journal of Vertebrate Paleontology, 40(1) : e1766477 - e1766477. doi: 10.1080/02724634.2020.1766477
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Dunkleosteus terrelli - Skull elements Fish Devonian Cleveland Shale - Cleveland, Ohio, USA Very Large 790mm (31 inch) slab with partial skull This is from James Boyle Ph.D a clinical assistant professor specializing in the study of placoderms. He noted: “Yes, it's most like a Dunkleosteus based on what I can see. You have both anterior dorsal lateral plates of the thoracic armor there. These are the bones that connected with a mobile joint the head and shoulder regions of the armor. The bone to the bottom left is the internal view of the left anterior dorsal lateral plate. The bone under it is the right anterior dorsal lateral plate in external view. The piece that's skewed to the right a bit in the image is part of the left anterior dorsal lateral plate as well. The easiest way to identify which of the two plates is the external (from the outside) view is that there's a sensory line canal on the one plate (it's straight nearly straight line tracing across the one bone at the top). These are the lateral line system you can still see in some modern fishes and act as pressure sensors to detect movement in the water around the organism. They are only found on the outside of the body. That oblong bone at the top is probably a piece of the paranuchal plate, but if that's the case it's only a very small fraction of it. I've attached a file with your image rotated a bit and some other images to compare against for Dunkleosteus.” I have contacted and heard back from Dr. Zerina Johnson of the natural history museum, UK who specializes in and published research papers on Devonian placoderms that the partial skull is indeed from Dunkleosteus terrelli Johanson Z (null) Vertebrate cranial evolution: Contributions and conflict from the fossil record. Evolution & Development, doi: 10.1111/ede.12422 Lebedev OA, Johanson Z, Kuznetsov AN, Tsessarsky A, Trinajstic K, Isakhodzayev FB (null) Feeding in the Devonian antiarch placoderm fishes: a study based upon morphofunctional analysis of jaws. Journal of Paleontology, 1 - 18. doi: 10.1017/jpa.2022.54 Charest F, Johanson Z, Cloutier R (2022) The preorbital depression and recess of antiarch placoderms (jawed stem-gnathostomes) revisited from an ontogenetic (saltatory) point of view. Journal of Vertebrate Paleontology, 42 (1) : doi: 10.1080/02724634.2022.2116335 Johanson Z (2021) Paleontology: There are more placoderms in the sea. Current Biology, 31 (16) : R1012 - R1014. doi: 10.1016/j.cub.2021.06.073 van Mesdag SNK, den Blaauwen J, Dean MN, Johanson Z (2020) Hyperossification in the vertebral column of Devonian placoderm fishes (Arthrodira). Journal of Vertebrate Paleontology, 40(1) : e1766477 - e1766477. doi: 10.1080/02724634.2020.1766477
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Recently acquired this rare 185mm nuchal bone from Dunkleosteus Terrelli, just thought to share it since there are very few Dunkleosteus material on the commercial market! Attached pictures below just to see the size of this since on most fish it's the size of your thumbnail! Devonian Cleveland Shale Cleveland, Ohio USA 185mm (7.2 inches) nuchal bone
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Dunkleosteus terrelli Devonian Cleveland Shale Cleveland Ohio, USA I've attached some pictures of where the nuchal bone is located on Dunkleosteus and what it looks like, also included two articles that are interesting reads! Fusion in the vertebral column of the pachyosteomorph arthrodire Dunkleosteus terrelli (‘Placodermi’) - Scientific Figure on ResearchGate. Available from: https://www.researchgate.net/figure/Dunkleosteus-terrelli-CMNH-50322-from-Late-Devonian-Famennian-Cleveland-Shale-of_fig1_332926169 [accessed 23 Jan, 2023] A large Late Devonian arthrodire (Vertebrata, Placodermi) from Poland - Scientific Figure on ResearchGate. Available from: https://www.researchgate.net/figure/Fragments-of-the-head-shield-of-Dunkleosteus-sp-A-specimen-Muz-PGI-NRI-1809II18_fig6_322500622 [accessed 23 Jan, 2023]
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From the album: Sharks and fish
Front side of armor which I believe could be the edge of the jaws! It comes to what would have been the razor sharp shearing edge, greatly worn down now, though. I also believe it could be the jaw because of the clear vertical wear lines on the surface, from being sheared against the inner surface of the other jaw, which is how they kept the edges razor sharp like scissors. I have seen similar wear lines on placoderm shearing jaws, so what I believe to be reasonable observations point to the possibility(maybe even likely?)of being from the cutting edge of the jaws. -
We recently moved to a new house, so It has been quite a busy few weeks since we last made a field trip. So I hadn’t much time to post the recent finds. On our last fieldtrip to the Belgian Late Devonian I made an exceptional find that I still wanted to share: I found a large piece of bone sticking out of a nodule. After the preparation and a some research I ‘suspected that the piece was a ADL (anterior dorsal lateral) armor plate from a Dunkleosteus. I’ve sent the pictures to a friend Palaeontologist specialised in Palaeozoic fish who confirmed the ID. Dunkleosteus sp. (ADL) Frasnian Chimay Belgium
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All of these were found on gravel bars on Elm Creek in north-eastern Kansas, as we kayak on it a lot.
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Dunkleosteus jaw: Is it real?
Praefectus posted a topic in Is It Real? How to Recognize Fossil Fabrications
Hello. I was wondering if I could get some opinions on the authenticity of this Dunkleosteus jaw. The jaw is coming from the Devonian of Morocco. It measures 12" long by 4" tall. The seller indicates that only the tip of the jaw was restored, but I suspect that the restoration may extend further. Thank you for your help. @Mioplosus_Lover24 Care to weigh in? Thanks..thumb.jpg.c41a054f903ffd14f1bde65c75e355fe.jpg)
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Can this be identified as Dunkleosteus? It's from Ashtabula, Ohio on auction site.
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From the album: Sharks and fish
Cross section of dunkleosteus' armor plate showing internal structure of mostly solid bone -
From the album: Sharks and fish
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Went out to Iowa for a Devonian hunt. Found a few placoderm teeth and what I'm told is a Dunkleosteus jaw/tooth bit. I'm happy. Can't wait to go back this Fall. I also found some nice crystals, pyrite and partial trilobites. Placoderm material Anyone know what this is from? My best guess is possible shark tooth.....? Dunkleosteus bit (it needs some prep and reconstruction)
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The Polish Geological Institute has just shared an article about the recent find in Poland - here you have an article in Polish, but worth looking at because of some pictures from the site and the images of the specimen http://www.pgi.gov.pl/aktualnosci/display/10405-wielki-drapieznik-z-gor-swietokrzyskich.html and here is the official paper regarding the discovery http://www.kirj.ee/public/Estonian_Journal_of_Earth_Sciences/2018/issue_1/earth-2018-1-33-42.pdf
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Postcranial anatomy of arthrodira like Dunkleosteus?
Mahnmut posted a topic in General Fossil Discussion
Hello dear people, I wonder where to find information and reference-images on the postcranial skeleton of dunkleosteus or related species. You find images of their iconically armoured skulls everywhere, but not a hint of the "fishbones". Is there so little fossil record? I hope someone can give me a hint. Thanks, J
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