living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
     Kingdom Animalia Linnaeus, 1758 - animals
       Subkingdom Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
         Phylum Chaetognatha Leuckart, 1854 - chaetognaths
           Class Sagittoidea
             Order Phragmophora Cooper, 1955 see Order Biphragmophora Casanova, 1985
               Family Spadellidae Tokioka, 1965
                 Genus Spadella Langerhans, 1880