[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 Alepocephalidae Bonaparte, 1846 - slickheads
           Genus Alepocephalus Risso, 1820
             1 Alepocephalus agassizii Goode & Bean, 1883 - Agassiz' smooth-head
             2 Alepocephalus bairdii Goode & Bean, 1879 - Baird's smooth-head
             3 Alepocephalus productus Gill, 1883 - smalleye smooth-head
             4 Alepocephalus rostratus Risso, 1820 - Risso's smooth-head