Class Mammalia Linnaeus, 1758 - mammals
   Subclass Theria Parker & Haswell, 1897
     Order Carnivora Bowdich, 1821 - carnivores
       Suborder Caniformia Kretzoi, 1943
         Family Phocidae Gray, 1821 - true seals
           Genus Monachus Fleming, 1822 - monk seals
             1 Monachus monachus (Hermann, 1779) - Mediterranean monk seal
             2 Monachus schauinslandi Matschie, 1905 - Hawaiian monk seal
             3 ‡Monachus tropicalis (Gray, 1850) - Caribbean monk seal