Species concept | American Ornithologists' Union 1st edition (1886) | American Ornithologists' Union 2nd edition (1895) | American Ornithologists' Union 3rd edition (1910) | American Ornithologists' Union 4th edition (1931) | American Ornithologists' Union 5th edition (1957) | American Ornithologists' Union 6th edition (1983) | American Ornithologists' Union 7th edition (1998) | American Ornithologists' Society 7th edition (incl. 62nd suppl.) |
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Gelochelidon [nilotica or macrotarsa]← | Gelochelidon nilotica Gull-billed Tern |
Gelochelidon nilotica Gull-billed Tern |
Gelochelidon nilotica Gull-billed Tern |
Gelochelidon nilotica Gull-billed Tern |
Gelochelidon nilotica Gull-billed Tern |
Sterna nilotica Gull-billed Tern |
Sterna nilotica Gull-billed Tern |
Gelochelidon nilotica Gull-billed Tern |
* Gelochelidon nilotica | |
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Gelochelidon nilotica nilotica | |
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Gelochelidon nilotica [aranea or vanrossemi] | |
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Gelochelidon nilotica aranea | |
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Gelochelidon nilotica aranea |
Gelochelidon nilotica aranea |
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Gelochelidon nilotica vanrossemi | |
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Gelochelidon nilotica vanrossemi |
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Gelochelidon nilotica affinis | |
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Gelochelidon nilotica affinis (affinis) | |
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[Gelochelidon nilotica affinis (addenda)] | |
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Gelochelidon nilotica gronvoldi | |
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* Gelochelidon macrotarsa | |
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