[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Pisces
     Class Osteichthyes Huxley, 1880 - bony fishes and tetrapods see Clade Osteichthyes Huxley 1880 [Moore & Near 2020]
       Order Anguilliformes Berg, 1943 - eels
         01 Family Anguillidae Rafinesque, 1810 - freshwater eels
         02 Family Heterenchelyidae Regan, 1912 - mud eels
         03 Family Chlopsidae Rafinesque, 1815 - false morays
         04 Family Muraenidae Rafinesque, 1815 - moray eels
         05 Family Synaphobranchidae Johnson, 1862 - cutthroat eels
         06 Family Ophichthidae Günther, 1870 - snake eels and worm eels
         07 Family Congridae Kaup, 1856 - conger eels
         08 Family Muraenesocidae Kaup, 1859 - pike conger eels
         09 Family Derichthyidae Gill, 1884 - longneck eels
         10 Family Nemichthyidae Kaup, 1859 - snipe eels
         11 Family Serrivomeridae Trewavas, 1932 - sawtooth eels
         12 Family Nettastomatidae Kaup, 1859 - duckbill eels