The Red Slug ( '' Arion rufus '' ; also known as the '' Chocolate Arion '' or the '' European red slug '' ) is a large slug , characterised by its usually red or brown body and lack of a keel .
The Red Slug ( '' Arion rufus '' ; also known as the '' Chocolate Arion '' or the '' European red slug '' ) is a large land slug , a terrestrial pulmonate gastropod mollusk in the family Arionidae , the roundback slugs . 
 It is characterised by its usually red or brown body and lack of a keel .