[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Pisces
     Class Chondrichthyes Huxley, 1880 - cartilaginous fishes
       Order Rajiformes Berg, 1940 - skates
         Family Rajidae Blainville, 1816 - skates
           Genus Rajella Stehmann, 1970
             1 Rajella bathyphila (Holt & Byrne, 1908) - deepwater ray
             2 Rajella bigelowi (Stehmann, 1978) - Bigelow's ray
             3 Rajella fyllae (Lütken, 1887) - round skate
             4 Rajella kukujevi (Dolganov, 1985)