Neornithes Gadow, 1893 - living birds
   Neognathae Pycraft 1900 see Cohort Neognathae Pycraft, 1900
     Galloanserae Sibley, Ahlquist & Monroe Jr., 1988 see Subcohort Galloanserae Sibley, Ahlquist & Monroe Jr., 1988
       [Order] Galliformes Temminck, 1820 - fowl
         phasianoids see Superfamily Phasianoidea Vigors, 1825
           Family Phasianidae Vigors, 1825 - turkeys, grouse, pheasants, partridges
             Subfamily Tetraoninae Vigors - grouse see Family Tetraonidae Vigors, 1825
               Genus Tetrastes Keyserling & Blasius, 1840
                 Tetrastes sewerzowi Przevalski, 1876 - Severtsov's hazel grouse
                   1 Tetrastes sewerzowi sewerzowiᵀ Przevalski, 1876
                   2 Tetrastes sewerzowi secunda Riley, 1925