What is the world's largest type of slug by length?

The world's largest type of slug by length is the Limax cinereoniger, commonly known as the Ash-black slug or Black slug. These slugs are native to Europe and can grow up to a whopping 30 centimeters in length!

The Ash-black slug is black or dark brown in color, with a pale undersurface, and has a slimy, cylindrical body. They are nocturnal and feed on dead or rotting vegetation, making them important for the natural recycling of organic matter in the ecosystem.

While not as well-known as their larger relatives, the Giant African Land Snails, the Ash-black slug is still an impressive creature and an important part of the natural world.