Three-eyed dinosaur shrimp, scientific name: horseshoe crab, also known as horseshoe tube, turtle cover, rollover, dung beetle and so on. In all parts of China, the only known horseshoe crab was found in China. It first appeared in the Paleozoic Carboniferous 300 million years ago. After three extinctions in the earth's century, several strains still exist and are widely distributed around the world. It is a small crustacean, belonging to Branchiopoda, Branchiopoda and Crustacea.