The silurian period was when a lot of fishes originated. But we haven't got many really good fossils of them. They tend to be a bit scruffy and scrappy and fragmentary. A particularly successful evolutionary invention of this kind of time is jaws. Basicallyo jawed fish. The earliest vertebrates didn't have jaws. Their mouths were kind of suckers. And only two kinds of jawleus vertebrates survive to day. They are the lampray and the hagfish.

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