Classification of Howard 1946
Or. Anseriformes Wagler 1831 [waterfowl]
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G. Sthenelides Stejneger 1884
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†Sthenelides paloregonus Cope 1878
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Invalid names: Anser condoni Shufeldt 1891 [synonym], Cygnus matthewi Shufeldt 1913 [synonym]
Fm. Anatidae Vigors 1825
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G. Pelecanus Linnaeus 1758 [pelican]
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Pelecanus erythrorhynchos Gmelin 1789 [American white pelican]
G. Phalacrocorax Brisson 1760 [cormorant]
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Phalacrocorax auritus Lesson 1831 [double-crested cormorant]
†Phalacrocorax macropus Cope 1878
G. Anas Linnaeus 1758
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Anas acuta Linnaeus 1758 [northern pintail]
Anas carolinensis Gmelin 1789 [green-winged teal]
Anas cyanoptera Viellot 1816 [cinnamon teal]
Anas platyrhynchos Linnaeus 1758 [mallard]
G. Colymbus Linnaeus 1758
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Colymbus nigricollis Brehm 1831 [black-necked grebe]
†Colymbus parvus Schufeldt 1913
G. Branta Scopoli 1769
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Branta bernicla Linnaeus 1758 [brant]
Branta canadensis Linnaeus 1758 [Canada goose]
†Branta hypsibata Cope 1878
†Branta propinqua Shufeldt 1891
Or. †Colymbiformes
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G. Aechmophorus Coues 1862
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Aechmophorus occidentalis Lawrence 1858 [western grebe]
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†Aechmophorus occidentalis lucasi Miller 1911
G. Chen Boie 1822
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Chen hyperborea Pallas 1769
Chen rossii Cassin 1861 [Ross's goose]
G. Nyroca Flemming 1822
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Nyroca americana Eyton 1838 [redhead]
Nyroca collaris Donovan 1809 [ring-necked duck]