Class [Mammalia] Linnaeus, 1758 - mammals
   Order Rodentia Bowdich, 1821 - rodents
     Family Geomyidae Bonaparte, 1845 - pocket gophers
       Genus Zygogeomys Merriam, 1895 - tuza
         1 Zygogeomys trichopus Merriam, 1895 - Michoacan pocket gopher