Lobe-finned fish are a group of fish characterized by their fleshy, lobed fins, which are more robust than the fins of other fish. This unique fin structure allows them to maneuver in shallow waters and even move across land for short distances. The most well-known lobe-finned fish are the coelacanth and lungfish. These fish are significant in evolutionary biology because they are considered the ancestors of all terrestrial vertebrates, including amphibians, reptiles, birds, and mammals. Lobe-finned fish possess a bony structure in their fins that resembles the limbs of land animals, highlighting their important role in the transition from water to land.