Scanning electronic micrographs micrographs of Parasphaerosyllis irregulata sp. nov. (paratype UANL 8160). A Middle section of the body, dorsal view, square showing an enlargement of a spherical cirrus with two terminal articles; B Posterior section of the body, dorsal view, where “b" means bulbous cirrus and “m” moliniform cirrus; C Terminal end, lateral view; D Anterior parapodium with falcigers; E Falcigers from middle body; F Falcigers from posterior parapodia. Scale bars: A, B = 0.5 mm; C = 0.1 mm; D, F = 10 µm, E = 5 µm.