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The revision of “Dalmanites” maecuruaClarke, 1890, from the Upper Lontra Member, Eifelian, Maecuru Formation, Pará State, Amazon Basin, Brazil is presented. The new genus Amazonaspis is assigned within the family Synphoriidae. Comparisons are made with other Silurian and Devonian synphoriids, and some paleobiogeographic inferences are presented.