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| genus = Ceramornis | parent_authority = Brodkorb, 1963 | species = major | authority = Brodkorb, 1963 }} ''Ceramornis'' is a prehistoric bird genus from the Late Cretaceous. It lived shortly before the Cretaceous–Paleogene extinction event in the Maastrichtian, some 〔Longrich, N. (2009). "An ornithurine-dominated avifauna from the Belly River Group (Campanian, Upper Cretaceous) of Alberta, Canada." ''Cretaceous Research'', 30(1): 161-177.〕 Its remains were found in the Lull 2 location, a Lance Formation site in Niobrara County, Wyoming (USA). A single species is known, ''Ceramornis major'', and even that only from a proximal piece of coracoid. This is specimen UCMP V53957, which was collected by a University of California team in 1958.〔Berkeley Natural History Museums: (Specimen Account: V53957 ) (''Ceramornis major''). Retrieved 2007-NOV-04.〕 Its relationships are unresolved, mainly due to the paucity of material. While the material is not enough to be assessed by wide-scale cladistic analysis,〔Mortimer (2004)〕 it has been quantitatively compared to other avian coracoids. The bone looks decidedly neornithine, and most similar to Charadriiformes especially. It is not certain that this clade was already distinct by the Maastrichtian.〔 While it is sometimes considered a neornithine and specifically to belong to the waterfowl (Anseriformes), this is far from certain. Though waterfowl must have been around by the time it lived, a phylogenetic analysis could not find any particularly close relationship with the ancestors of modern birds, and thus ''A. celer'' cannot be classified at present with more certainty than placing it in the Carinatae ''incertae sedis''.〔 Some have allied it with ''"Cimolopteryx"'' in the Cimolopterygidae. However, this seems a motley assemblage of plesiomorphic Neoaves (possibly basal Charadriiformes) or Neornithes rather than an evolutionary group.〔 ==References== (2004): The Theropod Database: (Phylogeny of taxa ). Retrieved 2013-MAR-02. 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「Ceramornis」の詳細全文を読む スポンサード リンク
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