[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Phylum Annelida Lamarck, 1809 - segmented worms
     Class Polychaeta Grube, 1850 - polychaetes
       Family Capitellidae Grube, 1862
         01 Genus Baldia Garwood & Bamber, 1988
         02 Genus Capitella de Blainville, 1828
         03 Genus Capitellethus Chamberlin, 1919
         04 Genus Dasybranchus Grube, 1850
         05 Genus Heteromastus McIntosh, 1885
         06 Genus Leiocapitella Hartman, 1947
         07 Genus Leiochrides Augener, 1914
         08 Genus Mastobranchus Eisig, 1887
         09 Genus Mediomastus Hartman, 1944
         10 Genus Neopseudocapitella Rullier & Amoureux, 1979
         11 Genus Notomastus Sars, 1851
         12 Genus Notoproctus Arwidsson, 1907
         13 Genus Paracapitella
         14 Genus Paraleiocapitella Thomassin, 1970
         15 Genus Peresiella
         16 Genus Pseudocapitella Fauvel, 1913
         17 Genus Pseudoleiocapitella
         18 Genus Pseudomastus Capaccioni-Azzati & Martin, 1992
         19 Genus Pseudonotomastus Warren & Parker, 1994