Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- proper noun A taxonomic
class within theinfraphylum Gnathostomata — an extinct class ofspiny sharks .
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
From Latin acanthodes.
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Examples
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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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