A naturally formed fossil specimen of a wolf-finned fish, from the Jehol Biota in western Liaoning, China, dates back approximately 140 million years. The fossil perfectly preserves the wolf-finned fish's skeleton, scales, fins, and other structures with clear details. The fish is approximately 8 centimeters long, and the rock slab is intact without any splicing or restoration. The wolf-finned fish is a hallmark species of the Jehol Biota and a typical representative of Mesozoic freshwater fish, possessing extremely high scientific research and collection value.