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The masked booby (''Sula dactylatra'') is a large seabird of the booby family, Sulidae. This species breeds on islands in tropical oceans, except in the eastern Atlantic; in the eastern Pacific it is replaced by the Nazca booby, ''Sula granti'', which was formerly regarded as a subspecies of masked booby.〔Pitman, R. L.; Jehl, J. R. (1998): Geographic variation and reassessment of species limits in the "Masked" Boobies of the eastern Pacific Ocean. ''Wilson Bulletin'' 110(2): 155-70〕〔Friesen, V. L.; Anderson, D. J.; Steeves, T. E.; Jones, H. & Schreiber, E. A. (2002): Molecular Support for Species Status of the Nazca Booby (''Sula granti''). ''Auk'' 119(3): 820–26. (with Spanish abstract ) DOI: 10.1642/0004-8038(2002)119()2.0.CO;2 (PDF fulltext )〕 It is also called the masked gannet or the blue-faced booby. A conspicuous and distinct gannet-like species, it was proposed for separation to a monotypic subgenus ''Pseudosula'', but the Nazca booby and as it seems also the brown booby (''S. leucogaster'') are quite close relatives. ==Classification== First described by French naturalist René-Primevère Lesson in 1831, the masked booby is one of six species of booby in the genus ''Sula''. The Nazca booby (''S. granti'') was formerly regarded as a subspecies. There are four subspecies, none of which is separable at sea: *''S. d. personata'' van Tets, Meredith, Fullagar & Davidson, 1988: Austropacific masked booby :Breeds in the central and western Pacific and around Australia, as well as off Mexico and on Clipperton Island. Birds of the latter two locations have been separated as subspecies ''granti'', and the north west Australian population has been named as subspecies ''bedouti'', but neither is usually considered valid. *''S. d. dactylatra'' van Tets, Meredith, Fullagar & Davidson, 1988: Atlantic masked booby :Breeds in the Caribbean and some Atlantic islands including Ascension Island. It has recently started breeding off Tobago, formerly being known in this area only from a single sight record from an oil rig off Trinidad. *''S. d. melanops'' van Tets, Meredith, Fullagar & Davidson, 1988: Western Indian Ocean masked booby :Breeds in the western Indian Ocean. *''S. d. tasmani'' (including ''S. d. fullagari'') van Tets, Meredith, Fullagar & Davidson, 1988: Tasman booby or Lord Howe masked booby :The form breeding on Lord Howe and the Kermadec Islands. Large prehistoric specimens known from the former and Norfolk Island are sometimes considered a distinct "species" (properly: subspecies). If this is correct, the extant population's name would be ''S. d. tasmani'' as ''S. d. fullagari'' was described after ''S. tasmani''. Comparison of ancient DNA form ''tasmani'' specimens and living ''fullagari'' indicates that they are not distinct. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Masked booby」の詳細全文を読む スポンサード リンク
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