Deroceras panormitanum is a species of air-breathing land slug, a terrestrial pulmonate gastropod mollusc in the family Agriolimacidae. This article is about Deroceras panormitanumsensu stricto, which is now known to occur only in Sicily and Malta. Previous to 2011, this name was also applied to what turned out to be a distinct species, Deroceras invadens, a species which has spread around the world and is often a pest. Because this is a recent change in...