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Hagerman horse
The Hagerman horse (''Equus simplicidens''), also called the Hagerman zebra or the American zebra, was a North American species of equid from the Pliocene epoch and the Pleistocene epoch. It was one of the oldest horses of the genus ''Equus''. Discovered in 1928 in Hagerman, Idaho, it is believed to have been similar to the Grévy's zebra of East Africa. It is the state fossil of Idaho.〔(Idaho: ''Equus simplicidens'' (state fossil). ) StateFossils.com〕
==Classification==
The Hagerman horse was given the scientific name of ''Plesippus shoshonensis'' in 1930 by a Smithsonian paleontologist named James W. Gidley〔 (1930) A new Pliocene horse from Idaho. ''Journal of Mammalogy'' 11: 300-303〕 who led the initial excavations at Hagerman that same year.
However further study by other paleontologists determined that fossils closely resembled fossils of a primitive horse from Texas named ''Equus simplicidens'', named by paleontologist Edward Drinker Cope in 1892. Because of this similarity, the two forms were interpreted〔 (1951) late Cenozoic vertebrates of the San Francisco Bay region. ''University of California Bulletin of the Department of Geological Sciences'' 28: 215-314〕 to be the same species, and since the name ''Equus simplicidens'' was the older name, it was retained following the taxonomic Principle of Priority. The Hagerman fossils represent the oldest widely accepted remains of the genus ''Equus''.
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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