The Devonian, part of the Paleozoic era, is otherwise known as the Age of Fishes, as it spawned a remarkable variety of fish. The most formidable of them were the armored placoderms, a group that ...

The Paleozoic era's Silurian period saw animals and plants ... compound eyes for searching out primitive fish, which they grabbed with their powerful, clawlike pincers. Fish were now diversifying ...