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 Phoca Linnaeus, 1758 - harbor, ringed, harp, and ribbon seals
             Phoca vitulina Linnaeus, 1758 - harbor seal
               1 [Phoca vitulina vitulina] Linnaeus, 1758
               2 Phoca vitulina concolor De Kay, 1842
               3 Phoca vitulina mellonae Doutt, 1942
               4 Phoca vitulina richardii (Gray, 1864)
               5 Phoca vitulina stejnegeri Allen, 1902