Lycoptera are mainly distributed in northern China. In western Liaoning, Beipiao has the largest number of fish, and is one of the most widely distributed fish in China. The wolf fin fish is generally well preserved and is buried in a still water environment. From the intensive situation of fossil burial, the fish seems to have a habit of swimming. The wolf-fin fish is a primitive bone fish with many species and is endemic to the endemic and East Asian species. According to relevant information, it is now extinct. The original real bone fish belongs to the super-mylon. Wolffish is mainly distributed in the Yixian Formation in western Liaoning. The fish is a unique freshwater fish in East Asia during the late Mesozoic era. It is widely distributed in Siberia, Mongolia, North Korea and northern China, and is a major member of the Rehe Biota. Wolffish fossils are generally well preserved and are buried in situ in a still water environment. From the intensive situation of fossil burial, the fish seems to have a habit of swimming. Wolf fin fish is still the earliest real bone fish found Appearance feature: The length of the wolf fin fish is generally about 10 cm, and the body is spindle-shaped or long-spindle. The dorsal fin is located posteriorly, opposite the anal fin, with an upper nerve spine in front of it. The membranous bone of the head has a thin interstitial layer, a tail-shaped type, and a round scale. The tip of the tooth is tapered. Very rare