Fish Groups – Discover Fishes https://www.floridamuseum.ufl.edu/discover-fish/fish/fish-groups/
Water covers over three-quarters of the earth’s surface. Fish live in this world of water and are the most numerous of the vertebrates, or animals with backbones. There are three major groups of living fish. Superclass Agnatha The first group is the Superclass Agnatha. This group is the most pri
Examples within the fossil record date back to 500 million years ago, in the late