[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 Osmeriformes Regan, 1913 - freshwater smelts
         Family Opisthoproctidae Schmidt, 1918 - spookfishes
           1 Genus Bathylychnops Cohen, 1958
           2 Genus Dolichopteryx Brauer, 1901
           3 Genus Opisthoproctus Vaillant, 1888
           4 Genus Rhynchohyalus Barnard, 1925