What is "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).