Banana Slugs are the largest of all North American slugs. The second-biggest of the keelback slugs describes the Limax maximus slug. One subspecies, the Pacific banana slug, can grow up to 9 inches long, making it the second-largest slug in the world. The largest known land gastropod is the African giant snail Achatina achatina, the largest recorded specimen of which measured 39.3 cm (15.5 in) from snout to tail when fully extended, with a shell length of 27.3 cm (10.75 in) in December 1978. They can reach a length of 25.4 cm (10 inces). Limax cinereoniger of Europe is the largest slug in the world. It weighed exactly 900 g (2 lb). Posted in Gardening, Slug Control, tagged banana slug, Biggest slug in the world, garden pests, get rid of slugs, Largest slug in world, Really big Slug on April 2, 2012| 15 Comments » This is our remedy for slug control. The banana slug is often bright yellow, though it can be brown, white, and green. This species, one of the largest slugs in the world, is native to Europe. Most adult Ariolimax slugs are about 15 - 20 cm (six to eight inches) in length. the biggest slug in the whole entire world is the lummox cinereoniger - Buy this stock photo and explore similar images at Adobe Stock Leopard slug (Limax maximus) on watermelon (Citrullus lanatus).