Arion sibiricusArion sibiricus, is a large terrestrial gastropod mollusk in the family Arionidae, the round back slugs.DescriptionThe organism has a small stature. Its upper side is obscurely blackish, but its sole is brighter. There is a black stripe or streak on its mantle which fades on the back. Its back is decorated with small, black, longitudinal lines among the wrinkles. The sole is brighter. The young one appears very similar to the brownish young of Arion. Anatomically, while it is similar to the same species in the configuration of the genital ducts, the internal structure of these ducts is quite different from it.DistributionThis species occurs in Siberia.External linbks