Acanthodians definitions

acanthodians

Now extinct, earliest group of fish with jaws, ranging from the Silurian to the Permian.
Found on http://www.fossilmall.com/Science/Glossary.htm

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Acanthodians

A primitive group of Silurian to Permian jawed bony fishes, bearing bony spines in front of all but their caudal fins.
Found on https://www.encyclo.co.uk/local/21202

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