Eugeneodontiformes

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What Wikipedia says

Eugeneodontiformes (also called Eugeneodontida) is an extinct and poorly known order of cartilaginous fishes. They possessed "tooth-whorls" on the symphysis of either the lower or both jaws, and pectoral fins supported by long radials. They probably lacked pelvic fins and anal fins.

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

Image: Creator:Dmitry Bogdanov, CC BY 3.0, via Wikimedia Commons.