[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 Chaetopteridae Malmgren, 1867
         Genus Mesochaetopterus Potts, 1914
           1 Mesochaetopterus minutus (Claparède, 1868)
           2 Mesochaetopterus sagittarius (Claparède, 1868)