Features;Species;"P. amazonica sp. n.";"P. fulgens (Levinsen, 1884)";"P. paucibranchiata Cerruti, 1909";"P. pycnobranchiata Fauchald, 1972";"P. pygoenigmatica Jones, 1968";"P. strelzovi Hartmann-Schröder, 1980" Eyes;absent;present;present;present;present;absent "Prostomial ciliated bands";absent;present;absent;absent;present;NI "First chaetiger with branchiae";4;4;4;6;6;4 "Number of branchiae pairs";4–8;16–25;4;20;15–19;4 "Branchiae shape";"foliaceous to rounded";"foliaceous to oval";cylindrical;"thick and distally blunt";Lanceolate;"large, smooth and ciliated" Prostomium;rounded;conical;ovoid;"rounded pentagonal";Conical;conical "Number of chaetigers";36–54;110–120;"at least 20";"at least 48";62–81;"> 27" Notochaetae;capillary;capillary;capillary;capillary;"capillary or limbate";"capillary and capillary fringed" "Pre-branchial and branchial neurochaetae";"capillary and acicular with lateral spine";"capillary and hook-shaped with fringe";"capillary and hook-shaped";capillary;"capillary or limbate";"capillary and capillary fringed and hooded spine" "Post-branchial neurochaeta";"acicular with lateral spine and hook-shaped with terminal spine";"hook-shaped with fringe";hook-shaped;"curved and pilose without aristae";"capillary or limbate and modified";"hooded spine" "Number of anal cirri";3;3;3;NI;"3 to 8";3 Habitat;"estuarine, intertidal";"marine, intertidal";marine;"deep sea";"marine, subtidal";"estuarine, subtidal" Bottom;muddy;"sand bottom";NI;NI;"sand bottom";NI "Type locality";"Amazon Coast, Brazil";Denmark;"Mediterranean Sea";"Gulf of California, USA";"Cape Cod Bay, USA";Australia