Native to South America, the Black Velvet Leatherleaf Slug is by far the most stylish of mollusks. In appearance it is unlike any of our native slugs and is being monitored as an invasive species by the scientists who concern themselves with that sort of thing. It is clearly the Batman-villain of lawn sod and forest leaf mat. Sightings have been recorded in all the US gulf coast states since 2005, when it was first spotted in Florida. This one crossed my path at a nearby park here in Houston, Texas.