The Dusky Slug or Dusky Arion (Arion subfuscus) is a non-native slug found throughout the United States. They were introduced from Europe. In many areas, their numbers are greater than native species.
They are relatively large slugs -- reaching up to 2.5 to 3 inches in length.
They can range in color from gray-brown to orange brown. They have a dark brown band running down their sides.
This family of slug breathes via lungs. A pneumostome, or breathing hole, is found on the right side of the slugs body (not seen in this photo).
