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Ibexaspis
''Ibexaspis'' is a trilobite in the order Phacopida (family Pliomeridae), that existed during the lower Ordovician in what is now the United States. It was described by Pribyl and Vanek in 1985, and the type species is ''Ibexaspis quattuor'', which was originally described under the genus ''Protopliomerops'' as the subspecies ''P. quattuor brevis'' by Young in 1973. The type locality was the Fillmore Formation in Utah.〔(Available Generic Names for Trilobites ) P.A. Jell and J.M. Adrain.〕 ==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「Ibexaspis」の詳細全文を読む
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