Acanthodian fish spine

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Fossil spine of a Devonian acanthodian fish (Machaeracanthus sp.).  Acanthodians are extinct class of jawed fish distinguished by the bony spines projecting in front of their fins. They are amongst the earliest vertebrates to evolve jaws and scales, and in form resembled a shark-like fish. Sandusky, Ohio, USA
Fossil spine of a Devonian acanthodian fish (Machaeracanthus sp.). Acanthodians are extinct class of jawed fish distinguished by the bony spines projecting in front of their fins. They are amongst the earliest vertebrates to evolve jaws and scales, and in form resembled a shark-like fish. Sandusky, Ohio, USA
Filename: acanthodian_10650.jpg
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