Annelida Lamarck, 1809 - segmented worms
   "polychaetes" see Class Polychaeta Grube, 1850
     Palpata G.W. Rouse & K. Fauchald, 1997
       Aciculata G.W. Rouse & K. Fauchald, 1997
         Phyllodocida see Order Phyllodocida Dales, 1962
           Aphroditiformia see Suborder Aphroditiformia Levinsen, 1883
             Aphroditoidea Malmgren, 1867
               Family Polynoidae Kinberg, 1856
                 Genus Halosydna Kinberg, 1855
                   Halosydna brevisetosa Kinberg, 1855