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Arion Rufus
The red slug, also known as the chocolate arion or the European red slug, Arion rufus, is a large land slug, a terrestrial pulmonate gastropod mollusc in the family Arionidae, the roundback slugs. This species is characterised by its (usually) red or brown body and lack of a keel.
I've moved this gorgeous slug from the Arthropods category to the Other category for you. Arthropods have exoskeletons -- think spiders, dragonflies, crabs.