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Definitions

from The Century Dictionary and Cyclopedia

  • An order of fossil ganoids of the Devonian and Carboniferous periods, connecting the ganoids and selachians, having a cartilaginous skeleton, heterocercal tail, small rhomboidal scales, and a fulcrum before each fin. It includes such genera as Acanthodes, Chiracanthus, Diplacanthus, etc.

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