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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 Palaeoraphe ： ウィキペディア英語版 Palaeoraphe ''Palaeoraphe'' is an extinct genus of palm, represented by one species, ''Palaeoraphe dominicana'' from early Miocene Burdigalian stage Dominican amber deposits on the island of Hispaniola. The genus is known from a single, diameter, full flower.〔 The holotype is currently deposited in the collections of the Oregon State University in Corvallis, Oregon, as number "Sd–9–158", where it was studied and described by Dr George Poinar.〔 Dr Poinar published his 2002 type description for ''Palaeoraphe'' in the ''Botanical Journal of the Linnean Society'' volume number 139.〔 The genus name is a combination of the Greek word ''palaios'' meaning "ancient" and ''Raphia'' a genus of palm, while the species name ''dominicana'' references the Dominican Republic where the fossil was discovered.〔 The type specimen was excavated from the La Toca mine northeast of Santiago de los Caballeros.〔 ''Palaeoraphe'' has been placed in the Corypheae subtribe Livistoninae, which has twelve modern genera found in both the old world and the new world.〔 Of the three modern genera the ''Palaeoraphe'' flower is similar in character ''Brahea'', ''Acoelorraphe'' and ''Colpothrinax'', with the structure being closest in structure to that of ''Brahea''.〔 Both genera having distinct sepals, petals with furrows facing the axis of the flower, and similarly shaped and sized anthers.〔 However the two genera can be told apart by the stigmas, which are united for their entire length in ''Brahea'', and by the more relaxed positioning of the anthers in ''Palaeoraphe''.〔 The flower of ''P. dominicana'' is a calyx of three broad sepals with irregular to fringed apices.〔 The three petals are joined at their bases and of the six stamins, those paired with petals are relxed into depressions on the petal surface, while the remaining three stamins are partially erect.〔 It is proposed by Dr. Poinar that ''Palaeoraphe'' may have been a stenotopic genus which was restricted to the Greater Antilles and possibly to just the island of Hispaniola.〔 The extinction of ''Palaeoraphe'' may have been caused by floral and faunal shifts during the Pliocene and Pleistocene.〔 ==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「Palaeoraphe」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.