living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
Status: extant
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
  Status: extant
     Kingdom Animalia Linnaeus, 1758 - animals
    Status: extant
       Subkingdom Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
      Status: extant
         Phylum Gnathostomulida Ax, 1956 - gnathostomulids
        Status: extant
           Order Filospermoidea Sterrer, 1972
          Status: extant
             Family Pterognathiidae Sterrer, 1972
            Status: extant
               Genus Pterognathia Sterrer, 1966
              Status: extant
                 Pterognathia swedmarki Sterrer, 1966
                Status: extant