Chordata Bateson, 1885 - chordates
   Class Elasmobranchii Bonaparte, 1838 see Subclass Elasmobranchii Bonaparte, 1838
     Subclass Selachii see Subdivision Selachii
       Order Tectospondyli
         1 Suborder Squaloidei Müller & Henle, 1838 see Order Squaliformes Compagno, 1973
         2 Suborder Squatinoidei Berg, 1940 [monotypic] see Order Squatiniformes Buen, 1926