 With the discovery of more complete fossils from Mazon Creek, Illinois, and Joggins, Nova Scotia, Samuel Scudder redescribed the fossils as amblypygids and moved the species to a new genus, "Graeophonus" as Graeophonus carbonarius.While describing the British species, "Graeophonus anglicus", Reginald Innes Pocock noted significant differences between the Nova Scotian and more complete Mazon Creek fossils.As a result he erected the species Graeophonus scudderi to accommodate the Mazon Creek specimen, and restricted species "G. carbonarius" to the Canadian specimens.