That’s not a worm, its a caecilian! Caecilians are amphibians just like frogs and salamanders but they lack limb all four limbs. There are part of the order Gymnophiona. Most people aren’t familiar with them because they live underground for most of their lives. They are found in Central America, South America, Asia, and Africa.
There are 10 different families of caecilians with over 200 species. Sadly, much is not known about caecilians.