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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 Sphenopalatine vacuities ： ウィキペディア英語版 Sphenopalatine vacuities In rodents, sphenopalatine vacuities are perforations of the roof of the mesopterygoid fossa, the open space behind the palate, in between the parapterygoid fossae.〔Weksler, 2006, p. 37, fig. 20〕 They may perforate the presphenoid or basisphenoid bone.〔 Their development and form are variable between and within species, and features of the sphenopalatine vacuities have been used as characters in cladistic analyses.〔Weksler, 2006, p. 37; Steppan, 1995, pp. 37–38; Carleton, 1980, p. 44〕 Among Oryzomyini, a mainly South American group, a 2006 study distinguished three character states—large, wide vacuities, as among others in ''Oligoryzomys'' and ''Holochilus''; small, narrow vacuities, as among others in ''Lundomys'' and ''Nephelomys''; and no or vestigial vacuities, as among others in ''Mindomys'' and ''Oryzomys''.〔Weksler, 2006, p. 37〕 Phyllotini all have very large sphenopalatine vacuities, as does ''Sigmodon''. The vacuities in ''Reithrodon'', formerly considered a phyllotine, are especially large.〔Steppan, 1995, p. 38〕 ''Nyctomys'' is special in having sphenopalatine vacuities restricted to the basisphenoid bone.〔 Character polarity for the development of the vacuities in Cricetidae is difficult to determine, but their absence may be primitive in the Neotominae.〔 The development of sphenopalatine vacuities has also been used to distinguish among members of the Sciurini group of squirrels.〔Moore, 1959, p. 179〕 ==References== 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「Sphenopalatine vacuities」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.