On Polycirrus changbunker sp. nov. (Annelida: Terebelliformia: Polycirridae), a new species of polycirrid worms from southwestern Atlantic

Polycirrus changbunker sp. nov. is herein described, from specimens collected off the states of Parana (type locality, southern Brazil), Sao Paulo (southeastern Brazil), and Pernambuco and Paraiba (northeastern Brazil). Members of Polycirrus changbunker sp. nov. present 31-43 pairs of notopodia, bearing pinnate and narrowly-winged chaetae, neuropodia beginning on segment 9, bearing type 1 uncini sensu Glasby & Glasby (2006) throughout, paired ventrolateral glandular pads on segments 3-13, and nephridial and genital papillae on segments 3-8. A full description for members of Polycirrus changbunker sp. nov. is herein provided, together with a comparison with the individuals of the most similar congener species.