|Common swifts (Apus apus)|
They are among the fastest birds in the world. They resemble swallows, to which they are not related, but have shorter tails and sickle-shaped wings. Swifts spend most of their life aloft, have very short legs and use them mostly to cling to surfaces.
The genus Apus was erected by the Italian naturalist Giovanni Antonio Scopoli in 1777 based on tautonymy and the common swift which had been given the binomial name Hirundo apus by the Swedish naturalist Carl Linnaeus in 1758. The name Apus is Latin for a swift, thought by the ancients to be a type of swallow with no feet (from Ancient Greek α, a, "without", and πούς, pous, "foot").
Before the 1950s, there was some controversy over which group of organism should have the genus name Apus. In 1801 Bosc gave the small crustacean organisms known today as Triops the genus name Apus, and later authors continued to use this term. Keilhack suggested (in 1909) that this was incorrect since there was already an avian genus named Apus by Scopoli in 1777 . It was not until 1958 that the controversy finally ended when the International Commission on Zoological Nomenclature (ICZN) ruled against the use of the genus name Apus and instead recognized the term Triops.
The genus contains 20 species:
- Cape Verde swift, Apus alexandri
- Common swift, Apus apus
- Plain swift, Apus unicolor
- Nyanza swift, Apus niansae
- Pallid swift, Apus pallidus
- African black swift, Apus barbatus
- Malagasy black swift, Apus balstoni
- Fernando Po swift Apus sladeniae
- Forbes-Watson's swift, Apus berliozi
- Bradfield's swift, Apus bradfieldi
- Pacific swift, Apus pacificus
- Salim Ali's swift, Apus salimalii
- Blyth's swift, Apus leuconyx
- Cook's swift, Apus cooki
- Dark-rumped swift, Apus acuticauda
- Little swift, Apus affinis
- House swift, Apus nipalensis
- Horus swift, Apus horus
- White-rumped swift, Apus caffer
- Bates's swift Apus batesi
Known fossil species are:
- Apus gaillardi (Middle/Late Miocene of La Grive-St.-Alban, France)
- Apus wetmorei (Early - Late Pliocene? of SC and SE Europe)
- Apus baranensis (Late Pliocene of SE Europe)
- Apus submelba (Middle Pleistocene of Slovakia)
The Miocene "Apus" ignotus is now placed in Procypseloides.
- Scopoli, Giovanni Antonio (1777). Introductio ad historiam naturalem (in Latin). Pragae: Apud Wolfgangum Gerle. p. 483.
- Peters, James Lee, ed. (1940). Check-list of Birds of the World. Volume 4. Cambridge, Massachusetts: Harvard University Press. p. 244.
- Linnaeus, C. (1758). Systema Naturæ per regna tria naturae, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis, Volume 1 (in Latin) (10th ed.). Holmiae:Laurentii Salvii. p. 192.
- Jobling, James A (2010). The Helm Dictionary of Scientific Bird Names. London: Christopher Helm. p. 52. ISBN 1408125013.
- O. S. Møller; J. Olesen; J. T. Høeg (2003). "SEM studies on the early larval development of Triops crancriformis (Bosc)(Crustacea: Branchiopoda, Notostraca)". Acta Zoologica. 84: 267–284. doi:10.1046/j.1463-6395.2003.00146.x.
- Hemming, Francis, ed. (1958). "Opinion 502". Opinions and Declarations Rendered by the International Commission on Zoological Nomenclature. Volume 18. London: International Trust for Zoological Nomenclature. pp. 65–120.
- Gill, Frank; Donsker, David, eds. (2017). "Owlet-nightjars, treeswifts & swifts". World Bird List Version 7.2. International Ornithologists' Union. Retrieved 2 June 2017.