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Eocypselus rowei
''Eocypselus rowei'' is an extinct bird believed to be ancestral to modern hummingbirds and swifts. It was a small bird, less than in length, and probably had black feathers. The bird was first described in 2013 and lived approximately 50 million years ago, during the Eocene epoch.
==Discovery and classification==
''Eocypselus rowei'' was first described in 2013 by Daniel T. Ksepka, Julia A. Clarke, Sterling J. Nesbitt, Felicia B. Kulp, and Lance Grande in the Proceedings of the Royal Society B: Biological Sciences.〔 The researchers spotted an exceptionally preserved specimen, originally harvested from the Green River Formation of Wyoming, while working at Chicago's Field Museum of Natural History. The specimen includes well preserved feathers and a nearly complete skeleton. It contains fossilized melanosomes, pigmentation cell structures.〔 They named the new species in honor of John Rowe, Chairman of the Field Museum's Board of Trustees.〔The discoverers chose to honor Rowe, whom they considered to be a "fossil geek."〔
According to its discoverers, ''E. rowei'' is a basal form of the order Apodiformes, which traditionally includes hummingbirds, tree swifts, and swifts. However, not all researchers agree that ''Eocypselus'' properly belongs to Apodiformes. Further studies are necessary to definitely establish ''E. roweis place in evolutionary history.〔 If Ksepka ''et al.''s classification is correct, then ''E. rowei'' would represent good evidence that hummingbird and swift ancestors first evolved their small size, then evolved divergent flying abilities.〔
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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