Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Craniata Linnaeus, 1758 see Subphylum Vertebrata Cuvier, 1812
     Pisces
       Class Actinopterygii Woodward, 1891 - ray-finned fishes
         Order Synbranchiformes - swamp eels
           1 Family Synbranchidae - swamp-eels
           2 Family Mastacembelidae - spiny-eels
           3 Family Chaudhuriidae