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Acer traini
''Acer traini'' is an extinct maple species in the family Sapindaceae described from isolated fossil samaras. The species was described from Miocene-aged fossils found in Canada and the United States of America. It is one of several extinct species placed in the living section ''Glabra''.
==History and classification==
''Acer traini'' is represented by a group of fossil specimens from a number of different geologic deposits in western North America. The northern most fossils have been reported from the Early Miocene Chilcotin River flora of Central British Columbia. Two localities in Oregon have produced fossils of the species. The White Hills site of the Mascall Formation in Northeast Central Oregon and the Trout Creek flora of southeastern Oregon while the Trapper Creek flora found in southern central Idaho is the furthest east locality for the species. Two Early to early Middle Miocene floras in Nevada host ''A. traini'' fossils, the Thurston Ranch flora of northeastern Nevada and the southern most occurrence of the species in the Purple Mountain flora in western central Nevada. The Chilcotin River flora found in preserved infilled paleovalleys overlain by Chilcotin Group flood basalts while the Mascall formation is composed of temporary lake beds interbedded with lava flows of the Columbia River Basalt Group.〔 Only one fossil is known from each locality, with the exception of the Trout Creek flora which produced two fossils, giving a total of only seven specimens. The holotype specimen of the species is number UMMP 65138, housed in the University of Michigan Museum of Paleontology and the paratype is specimen UCMP 9343, in the University of California Museum of Paleontology. The specimens were 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. traini'' in the ''Journal of the Faculty of Science, Hokkaido University''.〔 The etymology of the chosen specific name ''traini'' is in recognition of Percy Train, a fossil collector who amassed large collections of fossils from the Trout Creek flora.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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