[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Tetrapoda Hatschek & Cori 1896 [Gauthier, Kluge & Rowe 1988]
     Order Procellariiformes Fürbringer, 1888
       Family Gaviidae Allen, 1897 - divers
         Genus Gavia Forster, 1788
           1 Gavia adamsii (Gray, 1859) - white-billed diver
           2 Gavia arctica (Linnaeus, 1758) - black-throated diver
           3 Gavia immer (Brünnich, 1764) - common loon
           4 Gavia stellata (Pontoppidan, 1763) - red-throated diver