vertebrates Lamarck, 1801 - vertebrates see Infraphylum Vertebrata Lamarck, 1801
   Class †Cephalaspidomorphi Kiaer & Stensiö, 1920 see Class Osteostraci Lankester, 1868
     Subclass †Osteostraci Lankester, 1868 see Class Osteostraci Lankester, 1868
       Order †Cephalaspidiformes Halstead Tarlo, 1967
         Suborder †Cephalaspidoidei Halstead Tarlo, 1967
           Family †Cephalaspididae Agassiz, 1844, nom. praeval.
             Genus †Mimetaspis Stensiö, 1958
               †Mimetaspis retusa (Wängsjö, 1952)