Image: Mesacanthus Parexus Ischnacanthus
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Description: Various primitive acanthodians from Early Devonian England and Scotland, Mesacanthus pusillus, Parexus falcatus, Ishnacanthus gracilis (C) Stanton F. Fink
Title: Mesacanthus Parexus Ischnacanthus
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Usage Terms: Creative Commons Attribution 2.5
License: CC BY 2.5
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