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Arion intermedius is a species of land slug in the family Arionidae, the roundback slugs. It is known commonly as the hedgehog slug, hedgehog arion, or glade slug. It is native to Western Europe, and it is known as an introduced species in many other regions, including North America, Australia, New Zealand, North Africa, South Africa, and the Pacific Islands.
This slug is 1.5 to 2 centimeters long. It is variable in color and patterning, being white, orange, or gray, with or without banding, and it has gray tentacles and a yellow or orange sole. It becomes compact and "nearly bell-shaped" when contracted. The tubercles that texture the dorsal surface of its body taper to sharp, prickle-like points, inspiring the common name hedgehog slug.
For a long time, this hermaphroditic slug was thought to reproduce only by self fertilization; solitary captive specimens produced offspring and the species had never been observed mating. Genetic analysis provided evidence of crossing and the species is now believed to have a mixed breeding system, with an individual having the ability to fertilize itself or cross-fertilize, exchanging sperm with a mate.
As a pest
This is not considered to be a severe pest or invasive species, but some reports of such problems have been made. While most exotic slugs and snails are often found in altered environments, this species has a greater potential to invade natural habitat, such as forests. It may also displace native gastropod taxa. Its ability to self-fertilize allows a single individual to enter new habitat and then reproduce. It is also known as a pest of clover-seeded pastures in New Zealand.
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