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Limax maximus
5 inches long and about 1/2 inch thick.
Brick wall by outside basement door.
I've moved this slug from the Arthropod category to the Other category for you. Snails and slugs are Mollusks. Arthropods have an exoskeleton and jointed limbs in at least one phase of their life. Think dragonfly, bee, crab, and ant.