The order Anipodia, also called the order Caecilians, is primitive and at the same time an extremely specialized category. There are 162 species in 6 families, 34 genera. Widely distributed in tropical and subtropical areas between the equator and the Tropic of Cancer on all continents around the world. There are only 1 family and 2 species in our country. The specialized structure is related to their underground lifestyle, and their appearance resembles that of earthworms or snakes. The big one