Early Devonian eurypterids from the Northwest Territories of Arctic Canada

A new eurypterid fauna from the Lower Bear Rock Formation (Early Devonian, Emsian) of Anderson River, in the Northwest Territories of the Canadian Arc tic, is described. The material comprises an almost complete specimen and f ive isolated carapaces of Erieopterus microphthalmus; an incomplete carapac e and telson referred to Drepanopterus sp.; and an isolated prosomal append age of Carcinosoma sp. Associations include actinopterygian, sarcopterygian , and acanthodian fish, as well as lingulids, conchostracans, ostracodes, c oprolites, and plant material. A nearshore marine environment is inferred. This assemblage provides the first Canadian record of Drepanopterus and the youngest Canadian occurrences of erieopterid and carcinosomatid eurypterid s.