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Showing results for tags 'heterostracan'.
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Details of two Rhinopteraspid Fish's Ventral Preoral Regions
Biotalker posted a topic in General Fossil Discussion
I thought I would share this recent fossil purchase. I was fortunate to obtain this fossil from the lower Devonian in the southwestern region (Podolia) of Ukraine. Two ventral snout regions of type of heterostracan (jawless) fish called rhinopteraspid are exposed. The bone detail is simply remarkable. There is “tiling” of the underside of the long (rhino) snouts with dentine and/or aspidine (acellular enamel-like substance) in parallel lines arrays with a more uniform bone matrix underneath. The pre-oral-plate is angled in toward the mouth and displays many external textures of bone that presumably aided the fish’s feeding. I didn't expect to see this level of detail.- 4 replies
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- lochkovian
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Ancient fish fossils reveal origin of the vertebrate skeleton
Oxytropidoceras posted a topic in Fossil News
Ancient fish fossils reveal origin of the vertebrate skeleton By Brooks Hays, UPI, July 31, 2018 https://www.upi.com/Science_News/2018/07/31/Ancient-fish-fossils-reveal-origin-of-the-vertebrate-skeleton/3921533066983/ "These findings change our view on the evolution of the skeleton," said researcher Phil Donoghue. Joseph N. Keating, Chloe L. Marquart, Federica Marone, and Philip C. J. Donoghue. (2018) The nature of aspidin and the evolutionary origin of bone. Nature Ecology & Evolution. https://www.nature.com/articles/s41559-018-0624-1 Yours, Paul H.-
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- aspidin
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