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 Protostomia Grobben, 1908
                                        
 Superphylum Spiralia Schleip, 1929
                                          
 Clade Platytrochozoa Struck, Wey-Fabrizius, Golombek, Hering, Weigert, Bleidorn, Klebow, Iakovenko, Hausdorf, Petersen, Kück, Herlyn & Hankeln 2014
                                            
 Clade Lophotrochozoa Halanych, Bacheller, Aguinaldo, Liva, Hillis & Lake 1995 - lophotrochozoans
                                              
 Clade Trochozoa Beklemischev, 1944 - trochozoans
                                                
 Clade Tetraneuralia Wanninger 2009
                                                  
 Phylum Mollusca Linnaeus, 1758 - molluscs
                                                    
 Subphylum Conchifera Gegenbauer, 1878
                                                      
 Ganglioneura Rudophi, 1812
                                                        
 Clade Pleistomollusca Kocot, Cannon, Todt, Citarella, Kohn, Meyer, Santos, Schander, Moroz, Lieb & Halanych 2011
                                                          
 Class Gastropoda Cuvier, 1795 - snails and slugs
                                                            
 Subclass Orthogastropoda Ponder & Lindberg, 1995
                                                              
 Apogastropoda Salvini-Plawen & Haszprunar, 1987
                                                                
 Superorder Heterobranchia Burmeister, 1837
                                                                  
 Euthyneura Spengel, 1881
                                                                    
 Nudipleura Wägele & Willan, 2000
                                                                      
 Order Nudibranchia Cuvier, 1814 - "true" nudibranchs
                                                                        
 Euctenidiacea Tardy, 1970
                                                                          
 Doridacea Thiele, 1931
                                                                            
 Superfamily Polyceroidea Alder & Hancock, 1845
                                                                              
 Family Polyceridaeᵀ Alder & Hancock, 1845
                                                                                
 Genus Colga Bergh, 1880
                                                                                
 Genus Crimora Alder & Hancock, 1862
                                                                                
 Genus Galacera Risso-Dominguez, 1960
                                                                                
 Genus Polycerella Verrill, 1880
                                                                                
 Genus Roboastra Bergh, 1877
                                                                                
 Genus Thecacera Fleming, 1828
                                                                                
 1 Subfamily Polycerinaeᵀ Alder & Hancock, 1845
                                                                                
 2 Subfamily Kalinginae Pruvot-Fol, 1956 [monotypic]
                                                                                
 3 Subfamily Nembrothinae Burn, 1967
                                                                                
 4 Subfamily Triophinae Odhner, 1941