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From the album: Dunkleosteus terrelli partial skull
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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- 1 reply
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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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Hey TFF! Sorry to bug you guys with all these ID requests as of late, now that I have my own car and license I can now go to several (more like 2) fossil sites so I have quite a bit of material that I’m clueless about. Today my brother and his friend took me back to the river/creek where they found the cool rock erosion/formation and burrow fossils last time on his property. The trek was treacherous and the fossils were practically non existent, not so much as a brachiopod despite it being a perfect location with a huge shale outcropping and wall. I have a bunch of finds I am uncertain of, if anyone could help me identify them, that’d be great.
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Hello TFF, I am back from a long hiatus and am just updating my finds. Yesterday my brother discovered this rock at his friend’s creek in Parma, Ohio. I’m unsure if the formation is Cleveland Shale or not. I’m also equally unsure whether this is a fossil at all. If any of you guys know and could inform me that would be awesome. Thanks in advance, -Vraptor
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