Lobed-finned fish, also known as sarcopterygians, are a group of fish characterized by their fleshy, lobed fins. These fins are supported by bone structures similar to the limbs of tetrapods, which include amphibians, reptiles, birds, and mammals. This unique feature distinguishes them from other fish, which typically have ray-finned structures. Lobed-finned fish include both living species, such as the coelacanth and lungfish, and extinct species that played a crucial role in the evolution of land vertebrates. Their adaptations for life in shallow waters and the ability to breathe air have made them significant in understanding the transition from water to land.