Class Mammalia Linnaeus, 1758 - mammals
   Order Sirenia Gill, 1872 - sea cows
     Family Dugongidae Gray, 1821 - dugong and sea cow
       Genus ‡Hydrodamalis Retzius, 1794 - Steller's sea cow, great northern sea cow
         1 ‡Hydrodamalis gigas (Zimmermann, 1780) - Steller's sea cow