Invalid names: Euarctos vitabilis Gidley 1913 [synonym], Ursus altifrontalis Elliot 1903 [synonym], Ursus amblyceps Baird 1859 [synonym], Ursus amplidens Leidy 1853 [synonym], Ursus californiensis Miller 1900 [synonym], Ursus carlottae Osgood 1901 [synonym], Ursus floridanus Merriam 1896 [synonym], Ursus kermodei Hornaday 1905 [synonym], Ursus luteolus Griffith 1821 [synonym], Ursus machetes Elliot 1903 [synonym], Ursus optimus Schultz 1938 [synonym]