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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Parahesperornis ： ウィキペディア英語版 Parahesperornis ''Parahesperornis'' is a genus of prehistoric flightless birds from the Late Cretaceous. Its range in space and time may have been extensive, but its remains are rather few and far between, at least compared with its contemporary relatives in ''Hesperornis''. Remains are known from central North America, namely the former shallows of the Western Interior Seaway in Kansas. Found only in the upper Niobrara Chalk, these are from around the Coniacian-Santonian boundary, 85-82 million years ago (mya). ''Parahesperornis alexi'' (Martin, 1984) was long lumped with specimen YPM 1478, described initially as ''Hesperornis gracilis'' and later moved to the monotypic genus ''Hargeria'' (Lucas, 1903). It then turned out that this genus' description actually referred to specimen KUVP 2287, which eventually became the holotype of ''P. alexi''. Nonetheless, the taxon description of ''Hargeria'' was about ''"Hesperornis" gracilis'' exclusively, and thus despite the misidentification it applies to YPM 1478, the holotype of ''"H." gracilis''. This mistake was rectified by later authors, who sank ''Hargeria'' back into ''Hesperornis''.〔Bell, A. and Everhart, M.J. (2009). "A new specimen of ''Parahesperornis'' (Aves: Hesperornithiformes) from the Smoky Hill Chalk (Early Campanian) of Western Kansas." ''Transactions of the Kansas Academy of Science'', 112(1/2): 7-14.〕 ''Parahesperornis'' was a member of the Hesperornithes, flightless toothed seabirds of the Cretaceous and more specifically in the main lineage, close to ''Hesperornis''.〔Mortimer (2004)〕 Possibly the genus extended into the Campanian, to less than 80 mya. In any case, there are two very similar fossils from the Nemegt Formation (Maastrichtian or possibly late Campanian, around 76-66 mya), which were found at Tsagaan Kushu (Mongolia). Both are distal ends of tibiotarsi, and they seem certainly more similar to the bones of Hesperornithiformes and (due to the smallish size) to ''Parahesperornis'' specifically. However, they are not very diagnostic regardless, and the diversity of ''Parahesperornis'' remains enigmatic. ==Footnotes== 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「Parahesperornis」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.