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Introduction to the Petromyzontiformes

https://ucmp.berkeley.edu/vertebrates/basalfish/petro.html

“The long, eel-like fish drinking the blood of this lake trout is one of nearly fifty species of lampreys, a group of jawless fishes found in temperate rivers and coastal seas. Some species live in fresh water for their entire lives. Others, like the sea lamprey (Petromyzon marinus) shown here, are...” (from the page’s text)

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