Ariolimax columbianus (Gould, 1851) Pacific Banana Slug Arionidae, Stylommatophora, Gastropoda, Mollusca, Animalia Pacific Banana Slug Ariolimax The banana slug breathes through the Pneumostome This slug was on Bandera Mountain, King County, Washington, USA at an elevation of about 1600 meters (5240 feet) along a damp forest floor. i061507 068