The coelacanth is a rare type of fish that was thought to have gone extinct around 66 million years ago, until a living specimen was discovered off the coast of South Africa in 1938. This ancient fish belongs to the order Actinistia and is known for its distinctive lobed pectoral and pelvic fins, which resemble the limbs of land vertebrates. Coelacanths can grow up to 2 meters (6.5 feet) in length and have a unique, three-lobed tail. They primarily inhabit deep underwater caves and are known for their slow movement. Their discovery has provided valuable insights into the evolution of fish and the transition of life from water to land.