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