Edaphodon sp. (Ratfish), Trent River
Protosphyraena, fossil pectoral fin
Ancient swordfish, fossil pectoral fin -80 million yrs
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Fish first appeared during the Cambrian explosion, around 530 million years ago (Ma).
Early fish from the fossil record are represented by a group of small, jawless, armoured fish known as ostracoderms. Jawless fish lineages are mostly extinct.
An extant clade, the lampreys may approximate ancient pre-jawed fish. The first jaws are found in Placoderm fossils.