Black Velvet Leatherleaf Slug

I’ve spotted two in five years at my place in Florida. One on an exterior wall and this one on a cement walkway. Both after rain. ✅ A native of South America, this species is now established in the states that border the Gulf of Mexico (Walls 2009), including northern and central Florida. It occurs in greenhouses and nurseries, where it can be found under potted plants, so it is destined to be spread further with nursery stock.
Reference: https://entnemdept.ufl.edu/creatures/misc/gastro/slugs_of_florida.htm