[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 Notacanthiformes Goodrich, 1909 - halosaurs and deep-sea spiny eels
         Family Halosauridae Günther, 1868 - halosaurs
           1 Genus Aldrovandia Goode & Bean, 1896
           2 Genus Halosauropsis Collett, 1896
           3 Genus Halosaurus Johnson, 1864 - halosaur