This slug grows to over 20cm. Oval eggs (about 5 x 8 mm) are typical of this species. In some species, including the banana slug, this is where the mollusk will have a very small and flat shell. The slug is native to the dense, moist forest floors of the Pacific Northwest, ranging from Central California to Alaska. It can grow up to 10 inches long, move about 6.5 inches per minute, and can have variations in coloration based upon diet, exposure to light and elements, and the moisture levels present in the atmosphere. The Pacific banana slug can be found inhabiting humid coastal forests. The keel appears undulating in strongly contracted individuals and does not reach the mantle. Except for the beloved banana slug, most native snails and slugs go unnoticed as they feed on plants, fungi, or an array of decaying organic material. Native Range. Their alien nature can be … In some specimens, the black blotches occur simultaneously on the mantle and body and may even coalesce to give the slug a solid black. They often occur in moist climates like that of the Pacific. The hump on the back of a banana slug (Ariolimax columbianus) is called the mantle and that is also there for a purpose. The ariolimax columbianus, more commonly known as the banana slug, is a species of slug that is most commonly found in the forests of the Pacific Northwest (Thomas, 2000). There are 124 species of terrestrial molluscs (slugs and snails) in Oregon. Species. Starfish. These two widely unrelated species (the banana slug is a mollusk and the millipede an arthropod) are often seen along trails on the forest floor (although banana slugs also may be found in low shrubs or on the boles of trees). Largest North American land mollusk. The Pacific Banana Slug ariolimax columbianus is one of three very large slugs found in BC. Banana Slugs are herbivores. The apical portion of the penis bears a flagellum that is 2 to 4 times the length of the basal portion. Fertilized eggs are laid under logs or in leaves. In banana slugs, the mantle contains a pneumostome, or breathing hole, on the right side. The juveniles of this species are finely speckled. They belong to the same family of animals, called gastropods, which have no spine and only one foot. The banana slug, being a land dwelling species, is a pulmonate gastropod. In fact the Banana slug seen here on Gabriola is the second largest slug in the world and is native to BC. The Ariolimax genus for the Pacific Banana Slug means “air slug.” It is a shell-less terrestrial gastropod mollusk and is the world’s second largest slug species. It has been noted that A. columbianus displays homing behavior. These two widely unrelated species (the banana slug is a mollusk and the millipede an arthropod) are often seen along trails on the forest floor (al… The milky slug will travel up to 40 feet (12.2 m) in a single night. Description The Pacific banana slug is the second-largest species of terrestrials in the world, growing up to 10 inches long and weighing up to 4 ounces. This is an olive-colored banana slug. Named for their bright yellow color, banana slugs aren’t that different from the slugs you might try to keep out of your garden. The second largest species of slug in the world, Banana slugs live on the damp forest floors of the Western United States. Our guide to slugs and snails explains how these small gastropods play a vital role in the ecosystem, plus how to identify common species and to protect your plants in a wildlife-friendly way. Its lifespan is between one to seven years. Like all other mollusks they possess an anatomical feature called a “mantle”, a muscular cavity that encloses a space containing the respiratory chamber and other organs. They often are intercepted when they attempt to cross trails. Name that slug: slug taxonomy. Common Name. Some slugs have black spots. Photo by Ken Bevis, DNR The cylindrical body is usually black with yellow or red spots on the sides of the each segment. (Photo: Â© R. Forsyth, Smithers, BC, Canada), Ariolimax columbianus: genitalia. Yellow-spotted millipedes have 18-20 body segments and 31 pairs of legs (not a thousand like the name “millipede” suggests). This robust slug can attain a length of 185 to 260 mm and may weigh up to 72 g at maturity. They move in a straight, forward motion, versus centipedes which wiggle from side to side. The leopard slug is a natural enemy of Spanish slugs. The Leopard Slug (Limax maximus) Yet another species originally from Europe and North Africa that invades the whole world. The non-native slug Arion rufus was introduced from Europe within the last century. This slug species can be found in cultivated areas such as agricultural field crops, backyard gardens, roadside, parks, and meadows. The Pacific banana slug (A. columbianus), which is sometimes spotty, is the most widespread, and is found outside California. It is native to Europe, North Africa and the Atlantic Islands. (Photo: Â© Mead 1943 modified by K. Weigel, University of Florida), Ariolimax dolichophallus: genitalia. 95531. To humans the smell is pleasant and smells like almond extract, however, it is toxic to beetles and shrews in small doses. The yellow-spotted millipede is a species of arthropod in the Myriapoda, the “many-legged ones” a group that also includes centipedes. In B.C., this animal is found in the Coast and Mountains ecoprovince. This slug has a caudal mucus pore with the pneumostome (breathing pore) located behind the midpoint of the often finely granulated mantle. Banana slugs are important members of the redwood forest community, even if they aren’t the most exalted.