Petalodontiformes
Sign in to save200px|thumb|left|Teeth of Petalodus|Petalodus ohioensis Petalodontiformes ("thin-plate teeth") is an extinct order of marine cartilaginous fish related to modern day chimaera found in what is now the United States of America and Europe.
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200px|thumb|left|Teeth of Petalodus|Petalodus ohioensis Petalodontiformes ("thin-plate teeth") is an extinct order of marine cartilaginous fish related to modern day chimaera found in what is now the United States of America and Europe.
Most species are known only from isolated teeth. All fossils range from the Carboniferous to the Permian, where they are presumed to have died out during the Permian/Triassic extinction event.
Excerpted from Wikipedia’s “Petalodontiformes” article, available under the CC BY-SA 4.0 licence.