Class Mammalia Linnaeus, 1758 - mammals
   Order Carnivora Bowdich, 1821 - carnivores
     Family Phocidae Gray, 1821 - true seals
       Genus Phoca Linnaeus, 1758 - harbor, ringed, harp, and ribbon seals
         1 Phoca caspica Gmelin, in Linnaeus, 1788 - Caspian seal see Pusa caspica (Gmelin, 1788)
         2 Phoca fasciata Zimmermann, 1783 - ribbon seal see Histriophoca fasciata (Zimmermann, 1783)
         3 Phoca groenlandica Erxleben, 1777 - harp seal see Pagophilus groenlandicus (Erxleben, 1777)
         4 Phoca hispida Schreber, 1775 - ringed seal see Pusa hispida (Schreber, 1775)
         5 Phoca largha Pallas, 1811 - spotted seal
         6 Phoca sibirica Gmelin, in Linnaeus, 1788 - Baikal seal see Pusa sibirica (Gmelin, 1788)
         7 Phoca vitulina Linnaeus, 1758 - harbor seal