APUS

(Apodidae; Ϯ Common Swift A. apus) Specific name Hirundo apus Linnaeus, 1758; "APVS. BELLON. Alæ arcuatæ, ultra caudam sedentis extensæ. Nares ellipticæ, duplicatura in exteriore cantho instructæ. Mandibula utraque apice deflexa. Digiti quatuor, omnes anticis.  HIRVNDO Apus. LINN." (Scopoli 1777); “Three generic names have been used at various times for the Swifts. Apus Scopoli  ...  is preoccupied by Apos, introduced by the same author on p. 404 for a genus of Crustaceans. As these names are identical except for the interchange of “o” and “u,” the earlier one only is valid. The second is Micropus Meyer & Wolf [1810]  ...  This has been rejected by Sharpe (Hand-List, ii. 1900, p. 95), as the same name was applied to a genus of plants by Linnaeus, but under the present rules this no longer renders a name invalid for zoology, and Micropus should therefore be used. The third name, Cypselus Illiger, 1811, was used in the 1st edition of the List and by most of the earlier authors” (BOU 1915); "Apus Scopoli, Intr. Hist. Nat., 1777, p. 483. Type, by tautonymy, Hirundo apus Linné.1   ...   1 Not preoccupied by Apos Scopoli, 1777, Crustacea.  Replaces Cypselus Illiger, 1811, of Sharpe's Hand-list and Micropus Meyer and Wolf, 1810, of many recent authors." (Peters 1940, IV, 244).   
Synon. Apodium, Brachypus, Brevipes, Caffrapus, Colletoptera, Cypselus, Drepanis, Epicypselus, Micropus, Tetragonopyga.

Search for more names on the Key to Scientific Names in Ornithology by James A. Jobling.
Recommended citation
Jobling, J. A. (2019). Key to Scientific Names in Ornithology. In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.) (2019). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from www.hbw.com on 23 January 2019).