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Fishes

The oldest probable fishes are Early Cambrian.

Had fins, fish musculature and gills, but no jaws.

Remained insignificant until the Silurian.

The Silurian saw a rapid diversification of jawless fish, as well as the origin of jawed fish.

Lampreys and hagfish are surviving jawless fish.

Silurian

Left-hand image courtesy of Wikimedia Commons.

Right-hand image courtesy of NOAA.

Page 11

Lamprey mouths on aquarium glass.

Hagfish on the seafloor off Oregon.

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