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Overview
Acanthodii
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Class of primitive, fossil fish that had a true bony skeleton, a heterocercal tail fin, a persistent notochord, ganoid scales, and stout spines in front of the fins. The acanthodians lived from the Silurian Period to the Permian Period and may be related to ancestors of the more modern bony fish.
From: Acanthodii in A Dictionary of Zoology »
Subjects: Science and technology — Earth Sciences and Geography
