The lamellar dragon is a representative of the late plesiosaur class, with a small head disproportionate to the long neck. The flake dragon is huge, with a height of up to 14 meters and a weight of up to 7 tons. The strata are found in North America, and the living age is the late Cretaceous.

Plesiosaur is a collective term for the extinct marine reptiles of the genus Plesiosaur, belonging to the suborder Diptera and the order Pterosauriformes. It is a group adapted to living in shallow water environments, with large individuals and long necks, hence its name. It began to appear in the late Triassic period and spread all over the world by the Jurassic period, and became extinct by the end of the Cretaceous period. The plesiosaur were incredibly large in size and ruled the oceans of the Mesozoic era alongside ichthyosaurs. Its living habits are similar to modern sea lions, mainly living in the ocean and feeding on fish. It can be divided into long necked plesiosaurs and short necked plesiosaurs. Survived from Jurassic to Cretaceous.