Glassworm
（重定向自Chaoborus）
A glassworm is a type of midge larva called Chaoborus. They are also known as phantom midge larvae, because they are transparent. They can be found commonly in lakes all over the world and can be up to 2 centimeters in length.
Glassworms are almost entirely transparent, except for pairs of black kidney-shaped structures in the front and the back of the body. These dots are the air sacs. They use these air sacs to migrate up and down in lakes. Glassworms breathe through the end of their abdomen and have two small eyes at the front of their bodies.