A Review of the Lower Miocene Swifts (Aves: Apodidae)
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Smithsonian Institution Press
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Three nominal species of swifts have been described from lower Miocene (Aquitanian) deposits of France. Re-examination of these forms, Cypselus [ = Apus] ignotus Milne-Edwards, Collocalia incerta Milne-Edwards, and Cypselavus intermedius Gaillard, indicates that they are attributable to a single species, ignotus, referable to the modern genus Cypseloides. This provides the first occurrence of the Cypseloidinae in the fossil record and indicates a possible origin in the Old World for this primitive group of swifts, presently restricted to the New World.
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Collins, Charles T. 1976. "<a href="https://repository.si.edu/handle/10088/117165">A Review of the Lower Miocene Swifts (Aves: Apodidae)</a>." In <em>Collected papers in avian paleontology honoring the 90th birthday of Alexander Wetmore</em>. 129–132. Washington, D.C.: Smithsonian Institution Press. In <em> Smithsonian Contributions to Paleobiology</em>, 27. <a href="https://doi.org/10.5479/si.00810266.27.129">https://doi.org/10.5479/si.00810266.27.129</a>.