[Kingdom] Animalia Linnaeus, 1758 - animals
   Grade Enterozoa
     Grade Cœlomata
       Phylum Appendiculata {Lankester}
         Branch Chætopoda
           Class Polychœta
             Order Sedentaria (Lamarck, 1818)
               1 Genus Arenicola Lamarck, 1801
               2 Genus Sabella Linnaeus, 1767