http://www.gma.org/fogm/petromyzon_marinus.htm
There ya go then :P
It's a fish :P
http://en.wikipedia.org/wiki/Fish
"A fish is any member of a paraphyletic group of organisms that consist of all gill-bearing aquatic craniate animals that lack limbs with digits. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish..."
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