Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • proper noun A taxonomic class within the infraphylum Gnathostomata — an extinct class of spiny sharks.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Latin acanthodes.

Examples

  • Publishing the results of his research in a recent issue of the journal Nature, Martin Brazeau describes the first-known braincase of Ptomacanthus anglicus, an early jawed fish belonging to a group known as the Acanthodii that lived during the early Devonian period (418-412 million years ago).

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