Belongs within: Caprimulgiformes.
Chordeiles, nighthawks, is a New World genus of nightjars lacking strong bristles around the base of the upper mandible (Sclater 1866).
<==Chordeiles Swainson 1831 [Chordeilinae]B94
| i. s.: C. brasilianus (n. d.) [incl. C. pruinosus]S66
| C. gundlachiiJT12
|--C. (Chordeiles)S66 [incl. Podager Wagler 1832B94; Podagerinae]
| | i. s.: C. (C.) henryiS66
| | C. (C.) texensisS66 [=C. acutipennis texensisS18]
| | C. (C.) virginianus [=Caprimulgus virginianus; incl. Ch. popetue]S66
| |--+--C. (C.) pusillus Gould 1861BKB15, S66
| | `--C. nacundaBKB15 [=Caprimulgus nacundaS66, Podager nacundaJT12; incl. C. campestrisSc66, C. diurnusS66]
| `--+--C. (C.) minor Cab. 1856BKB15, S66
| `--+--C. (C.) acutipennisBKB15 (see below for synonymy)
| | |--C. a. acutipennisW51
| | `--C. a. micromeris Oberholser 1914W51
| `--C. (C.) rupestrisBKB15 [=Caprimulgus rupestrisS66]
`--C. (Podochaetes) leucopygus [=Caprimulgus leucopygus, Lurocalis leucopygus]S66
Chordeiles (Chordeiles) acutipennisBKB15 [=Caprimulgus acutipennisS66; incl. Ca. acutusS66, Chordeiles acutusS66, Ch. labeculatus Jard. 1846S66, Ca. sapitiS66]
*Type species of generic name indicated
References
[B94] Bock, W. J. 1994. History and nomenclature of avian family-group names. Bulletin of the American Museum of Natural History 222: 1–281.
[BKB15] Burleigh, J. G., R. T. Kimball & E. L. Braun. 2015. Building the avian tree of life using a large-scale, sparse supermatrix. Molecular Phylogenetics and Evolution 84: 53–63.
[JT12] Jetz, W., G. H. Thomas, J. B. Joy, K. Hartmann & A. Ø. Mooers. 2012. The global diversity of birds in space and time. Nature 491: 444–448.
[S66] Sclater, P. L. 1866. Notes upon the American Caprimulgidae. Proceedings of the Zoological Society of London 1866: 123–145.
[S18] Stone, W. 1918. Birds of the Panama Canal Zone, with special reference to a collection made by Mr. Lindsey L. Jewel. Proceedings of the Academy of Natural Sciences of Philadelphia 70: 239–280.
[W51] Wetmore, A. 1951. Additional forms of birds from Colombia and Panamá. Smithsonian Miscellaneous Collections 117 (2): 1–11.