living organisms
 see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
  
 Superkingdom Eukaryotae
 see Domain Eukaryota Chatton, 1925
    
 Kingdom Animalia Linnaeus, 1758 - animals
      
 Subkingdom Eumetazoa Butschli, 1910
 see [unranked] Eumetazoa Bütschli, 1910
        
 Phylum Arthropoda Siebold, 1848 - arthropods
          
 Subphylum Crustacea Brünnich, 1772 - crustaceans
 see Superclass Crustacea Pennant, 1777
            
 Subclass Copepoda H. Milne-Edwards, 1840 - copepods
              
 Order Calanoida Sars, 1903
                
 Suborder Amphascandria
 see Order Calanoida Sars, 1903
                  
 Family Calocalanidae Bernard, 1958
                    
 Genus Ischnocalanus Bernard, 1963
 see Genus Calocalanus Giesbrecht, 1888