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 Eukrohniidae Tokioka, 1965
                 1 Genus Eukrohnia Ritter-Záhony, 1909
                 2 Genus Heterokrohnia Ritter-Záhony, 1911
                 3 Genus Bathyspadella Tokioka, 1939
                 4 Genus Krohnittella Germain & Joubin, 1912
                 5 Genus Zahonya nom. rej.