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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 Acer castorrivularis ： ウィキペディア英語版 Acer castorrivularis ''Acer castorrivularis'' is an extinct maple species in the family Sapindaceae described from a solitary fossil leaf. The species is known from the latest Eocene sediments exposed in the state of Montana, USA. It is one of several extinct species placed in the living section ''Macrantha''. ==History and classification== ''Acer castorrivularis'' is represented by a single fossil specimen that was recovered from a late Eocene, possibly Chadronian aged, outcrop of the Beaver Creek flora, although it was found north of the Ruby Flora, which outcrops in southeast Montana. The similarities in overall floral composition between the Beaver Creek, Ruby, and other Montana floras are interpreted by Wolfe and Tanai to indicate that the assemblages are coeval in nature. The age of the Ruby flora is considered to range from approximately to approximately or as young as , meaning a probable similar age for the Beaver Creek assemblage. The Beaver Creek assemblage was host to a total of five ''Acer'' species in 1987: ''A. castorrivularis'', ''A. florissanti'', ''A. milleri'', ''A. salmonense'', and ''A. tiffneyi''.〔 The species was described from a lone type specimen, the holotype leaf specimen UCMP 93l0A, B. Both the part and counterpart of the type specimen are currently preserved in the paleobotanical collections housed at the University of California Museum of Paleontology in Berkeley, California.〔 The specimen was studied by paleobotanists Jack A. Wolfe of the United States Geological Survey, Denver office and Toshimasa Tanai of Hokkaido University. Wolfe and Tanai published their 1987 type description for ''A. castorrivularis'' in the ''Journal of the Faculty of Science, Hokkaido University''.〔 The etymology of the chosen specific name ''castorrivularis'' is a combination of the words "''Castor''", the genus name for beavers, and "rivularis", Latin for rill or brook, in recognition of the type and only location for the species at Beaver Creek.〔 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「Acer castorrivularis」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.