Gymnelis Viridis is a type of green worm commonly found in freshwater habitats. It is also known as the green hair worm due to its slender, green appearance. Some synonyms for Gymnelis Viridis include Nemertea Viridis, Amphiporus Viridis, and Lineus Viridis. These worms have a unique ability to stretch to incredible lengths and can grow up to several meters in length. They are incredibly active predators and mainly feed on small invertebrates and crustaceans. The green hair worm plays an essential role in the ecosystem by maintaining a balance in the food chain. They are also useful in laboratory studies due to their transparent nature, allowing researchers to study their internal anatomy with ease.