Class Mammalia Linnaeus, 1758 - mammals Order Sirenia Gill, 1872 - sea cows Family Trichechidae Gill, 1872 - manatees Genus Trichechus Linnaeus, 1758 - manatees 1 Trichechus inunguis (Natterer, in Pelzeln, 1883) - Amazon manatee 2 Trichechus manatus Linnaeus, 1758 - Caribbean manatee 3 Trichechus senegalensis Link, 1795 - African manatee