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Cypselomorphae
Cypselomorphae is a clade of birds. It includes the living families and orders Caprimulgidae (nightjars, nighthawks and allies), Nyctibiidae (potoos), Apodiformes (swifts and hummingbirds), as well as the Aegotheliformes (owlet-nightjars) whose distinctness was only recently realized. The Apodiformes (which include the "Trochiliformes" of the Sibley-Ahlquist taxonomy) and the Aegotheliformes form the Daedalornithes.〔Sangster, G. (2005) A name for the clade formed by owlet-nightjars, swifts and hummingbirds (Aves). Zootaxa: 799:1-6.〕
==Systematics==
The material evidence for this group is very equivocal; the most ancient Cypselomorphae are quite nondescript tree-dwellers but already tend towards peculiarly apomorphic feet, and no Cretaceous fossils are known. Torpor and other metabolic peculiarities are very frequently found in this group, perhaps more often than in any other bird lineage. The synapomorphies that define this clade are the ''ossa maxillaria'' separated by a large cleft, a mandible with very short ''pars symphysialis'', and ''rami mandibulae'' very slender in their distal half.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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