Early jawless fish were likely to have used bony projections surrounding their mouths to modify their mouth shape while they ...

While the common ancestor of vertebrates with synovial joints is still a mystery, the oldest specimen with evidence of these ...

It was not so terribly long ago; that the original planktonic mix gave birth to some zillion critters with the advantage of ...

The most ancient fish were jawless, and since our whole group has jaws, we can safely choose a jawless fish as a fairly recent ancestor. Unfortunately, this ancestor is long dead. To compare ...

DESCRIPTION: Pacific lamprey are slender, eel-like fish that are dark blue or brown in color and grow to about 30 inches long. They have lateral eyes, lack paired fins, and have no scales. Adult ...