Perinereis anderssoni Kinberg, 1865 originally described from Brazil has been attributed with a wide distribution on the American Atlantic coasts, ranging to Bermuda, due synonymy of Nereis bairdii Webster, 1884 and (Perinereis) melanocephala McIntosh, 1885. In this paper, is rejected based re-examination syntypes N. which are found contain two species requiring designation lectotype paralectot...