The species confined to a particular region and not found elsewhere is termed as

The species confined to a particular region and not found elsewhere is termed endemic species. E.g., Kangaroos of Australia, Kiwis of New Zealand.Keystone species are those that drive major ecosystem functions. E.g., PisasterAlien species are species that occur outside their ​natural range and dispersal potential. E.g., Parthenium, Lantana introduced to India.A rare species is a group of organisms that are very uncommon, scarce, or infrequently encountered. E.g., Nilgiri Tahr