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
       Galliformes Temminck, 1820 - fowl
         phasianoids see Superfamily Phasianoidea Vigors, 1825
           Phasianidae Vigors, 1825 - turkeys, grouse, pheasants, partridges
             Tetraoninae Vigors - grouse see Family Tetraonidae Vigors, 1825
               Tympanuchus Gloger, 1841
                 Tympanuchus phasianellus (Linnaeus, 1758) - sharp-tailed grouse
                   1 Tympanuchus phasianellus caurus (Friedmann, 1943)
                   2 Tympanuchus phasianellus kennicottii (Suckley, 1862)
                   3 Tympanuchus phasianellus phasianellus (Linnaeus, 1758)
                   4 Tympanuchus phasianellus columbianus (Ord, 1815)
                   5 Tympanuchus phasianellus jamesi (Lincoln, 1917)
                   6 Tympanuchus phasianellus campestris (Ridgway, 1884)
                   7 ‡Tympanuchus phasianellus hueyi Dickermann & Hubbard, 1994