Big fish fossil-Jinanichthys From: Asia Fossil age: Late Jurassic to Early Cretaceous Size: 24*16cm [Biome] Jehol Biota [Biological information] Long-headed Jinan fish has 20 to 21 pairs of ribs, extending to the ventral edge. It has about 47 vertebrae, including about 23 tail vertebrae. The body is slender and spindle-shaped, the head is longer than the body height, and the operculum is slightly rounded. shape. The upper and lower branches of the preopercular bone are nearly equal in length, and the intersection angle between the outer edges of the two branches is slightly larger than a right angle. The front upper collar bone is small and toothed. The upper collar bone is large, the dentary bone has an obvious coronoid process, and the mouth edge has teeth. The body of the fish is very good, the ribs, head, and spine are all clearly visible. It is a very good collection.