[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Pisces
     Class Agnatha Cope, 1889
       Order Petromyzontiformes Berg, 1940 - lampreys
         Family Petromyzontidae Bonaparte, 1832 - lampreys
           Genus Lethenteron Creaser & Hubbs, 1922
             1 Lethenteron camtschaticum (Tilesius, 1811) - Arctic lamprey