Neornithes Gadow, 1893 - living birds
Neognathae Pycraft 1900
see Cohort Neognathae Pycraft, 1900
Neoaves Sibley et al. 1988
see Subcohort Neoaves Sibley et al., 1988
[Order] Charadriiformes Huxley, 1867 - shorebirds, gulls, auks
Family Laridae Vigors, 1825 - gulls, terns and skimmers
Subfamily Larinae Vigors, 1825 - gulls
Genus Larus Linnaeus, 1758
Larus occidentalis Audubon, 1839 - western gull
1 Larus occidentalis occidentalis Audubon, 1839
2 Larus occidentalis wymani Dickey & van Rossem, 1925