The phylogenetic affinity of the Ordovician trilobites Agerina, Forteyaspis gen. nov., and related genera, with new and revised species from Canada and the United States

Canadian Journal of Earth Sciences, Ahead of Print.A phylogenetically related group of variably well-known Ordovician trilobites have in the past been assigned to six separate genera and a number of families, and their taxonomic cohesiveness has not always been recognized. When most of them have been understood to form an evolutionarily related group, they have historically most often been assigned to the genus Agerina Tjernvik, 1956, and assigned initially to Bathyuridae Walcott, 1886, and more