Annelida Lamarck, 1809 - segmented worms
   "polychaetes" see Class Polychaeta Grube, 1850
     Palpata G.W. Rouse & K. Fauchald, 1997
       Canalipalpata G.W. Rouse & K. Fauchald, 1997
         Spionida see Order Spionida Rouse & Fauchald, 1997
           1 Family Chaetopteridae Malmgren, 1867
           2.1 Genus Magelona F. Müller, 1858
           2.2.1 Genus Apistobranchus Levinsen, 1883[1884]
           2.2.2 Family Spionidae Grube, 1850
           2.2.2.1 Genus Heterospio Ehlers, 1875
           2.2.2.2.1 Family Uncispionidae Green, 1982
           2.2.2.2.2.1 Genus Poecilochaetus Claparède, 1875
           2.2.2.2.2.2 Genus Trochochaeta Levinsen, 1883