Acanthodii

Rarity: Rare

A topic known well beyond its field, found in many languages.

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What Wikipedia says

Acanthodii or acanthodians is an extinct class of gnathostomes (jawed fishes). They are currently considered to represent a paraphyletic grade of various fish lineages basal to extant Chondrichthyes, which includes living sharks, rays, and chimaeras.

Excerpt from the Wikipedia article “Acanthodii”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: No machine-readable author provided. Јованвб assumed (based on copyright claims)., CC BY 2.5, via Wikimedia Commons.