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Emigrantia
''Emigrantia'' is an extinct genus of trilobites, fossil marine arthropods, of small to average size. It lived during the Toyonian stage (last phase of the Upper ''Olenellus''-zone), in what is today the South-Western United States. ''Emigrantia'' can easily be distinguished from other trilobites by the sturdy but not inflated genal spines, that are attached at midlenght of the cephalon, in combination with effaced features of the raised axial area of the head shield (or glabella). == Etymology == The name of the genus is derived from Emigrant Pass, Nopah Range, California, near the collection site of many of the last of the Lower Cambrian Olenellina.
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「Emigrantia」の詳細全文を読む
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