Natura - nature
  
 actualia - actual entities
    
 Mundus Plinius - physical world
      
 naturalia - natural bodies
        
 Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
          
 Clade neomura Cavalier-Smith, 1987
            
 Domain Eukaryota Chatton, 1925 - eukaryotes
              
 Clade discaria Cavalier-Smith, 2021
                
 Clade dorsates Cavalier-Smith, 2021
                  
 Clade podiates Cavalier-Smith, 2012
                    
 Clade Amorphea Adl et al. 2012 [Simpson, Medina & Adl 2020]
                      
 Clade Obazoa Brown, Sharpe, Silberman, Heiss, Lang, Simpson & Roger 2013
                        
 Clade Opisthokonta Cavalier-Smith 1987 [Simpson & Medina 2020] - animal-fungal clade
                          
 Superkingdom Holozoa Lang, O'Kelly, Nerad, Gray & Burger, 2002
                            
 Clade filozoa Shalchian-Tabrizi, Minge, Espelund, Orr, Ruden, Jakobsen & Cavalier-Smith, 2008
                              
 Kingdom Animalia Linnaeus, 1758 - animals
                                
 Clade Planulozoa Wallberg, Thollesson, Farris & Jondelius 2004
                                  
 Subkingdom Bilateria Hatschek, 1888 - bilaterians
                                    
 Clade Nephrozoa Jondelius, Ruiz-Trillo, Baguñà & Riutort 2002
                                      
 Infrakingdom Deuterostomia Grobben, 1908
                                        
 Phylum Chordata Bateson, 1885 - chordates
                                          
 Subphylum Craniata auct.
                                            
 Infraphylum Vertebrata Lamarck, 1801 - vertebrates
                                              
 Clade Pan-Gnathostomata Downs 2020
                                                
 Superclass Gnathostomataᵀ Gegenbaur, 1874 - jawed vertebrates
                                                  
 [crown] Clade Eugnathostomata
                                                    
 Clade Pan-Osteichthyes Rowe 2004 [Moore & Near 2020]
                                                      
 Clade Osteichthyes Huxley 1880 [Moore & Near 2020]
                                                        
 Clade Pan-Actinopterygii Rowe 2004 [Moore & Near 2020]
                                                          
 Clade Actinopterygiiᵀ Woodward 1891 [Moore & Near 2020]
                                                            
 Clade Pan-Actinopteri Moore & Near 2020
                                                              
 Class Actinopteri Cope, 1871
                                                                
 Subclass Neopterygii Regan, 1923
                                                                  
 Infraclass Teleosteomorpha Arratia, 2001
                                                                    
 Division Teleostei Müller, 1845
                                                                      
 Supercohort Teleocephala de Pinna, 1996 - crown-group Teleostei
                                                                        
 Cohort Clupeocephala Patterson & Rosen, 1977
                                                                          
 Subcohort Otomorpha Wiley & Johnson, 2010
                                                                            
 Superorder Alepocephali
                                                                              
 Order Alepocephaliformesᵀ - slickheads and tubeshoulders
                                                                                
 Family Alepocephalidaeᵀ Bonaparte, 1846 [non-monophyletic] - slickheads
                                                                                  
 Genus Alepocephalusᵀ Risso, 1820
                                                                                    
 Alepocephalus agassizii Goode & Bean, 1883 - Agassiz' smooth-head
                                                                                    
 Alepocephalus andersoni Fowler, 1934
                                                                                    
 Alepocephalus antipodianus (Parrott, 1948)
                                                                                    
 Alepocephalus asperifrons Garman, 1899
                                                                                    
 Alepocephalus australis Barnard, 1923 - brown slickhead
                                                                                    
 Alepocephalus bairdii Goode & Bean, 1879 - Baird's smooth-head
                                                                                    
 Alepocephalus bicolor Alcock, 1891
                                                                                    
 Alepocephalus blanfordii Alcock, 1892
                                                                                    
 Alepocephalus dentifer Sazonov & Ivanov, 1979
                                                                                    
 Alepocephalus fundulus Garman, 1899
                                                                                    
 Alepocephalus longiceps Lloyd, 1909
                                                                                    
 Alepocephalus longirostris Okamura & Kawanishi, 1984
                                                                                    
 Alepocephalus melas de Buen, 1961
                                                                                    
 Alepocephalus owstoni Tanaka, 1908
                                                                                    
 Alepocephalus planifrons Sazonov, 1993
                                                                                    
 Alepocephalus productus Gill, 1883 - smalleye smooth-head
                                                                                    
 Alepocephalus rostratus Risso, 1820 - Risso's smooth-head
                                                                                    
 Alepocephalus tenebrosus Gilbert, 1892 - California slickhead
                                                                                    
 Alepocephalus triangularis Okamura & Kawanishi, 1984
                                                                                    
 Alepocephalus umbriceps Jordan & Thompson, 1914 - slickhead