Class [Mammalia] Linnaeus, 1758 - mammals
   Order Rodentia Bowdich, 1821 - rodents
     Family Muridae Batsch, 1788 - rats, mice, hamsters, voles, lemmings, and gerbils
       Subfamily Hesperomyinae Murray, 1866 - New-World mice and rats see Subfamily Sigmodontinae Wagner, 1843
         Genus Oryzomys Baird, 1857 - rice rats
           01 Oryzomys albigularis Tomes, 1860 - Tomes' rice rat
           02 Oryzomys alfari - Alfaro's water rat see Sigmodontomys alfari J. A. Allen, 1897
           03 Oryzomys alfaroi (J.A. Allen, 1891) - Alfaro's rice rat see Handleyomys alfaroi (J.A. Allen, 1891)
           04 Oryzomys altissimus see Microryzomys altissimus Osgood, 1933
           05 Oryzomys andinus see Oligoryzomys andinus Osgood, 1914
           06 Oryzomys aphrastus Harris, 1932 - Harris's rice rat see Sigmodontomys aphrastus Harris, 1932
           07 Oryzomys arenalis see Oligoryzomys arenalis Thomas, 1913
           08 Oryzomys auriventer Thomas, 1890
           09 Oryzomys balneator Thomas, 1900
           10 Oryzomys bauri see Oryzomys galapagoensis bauri
           11 Oryzomys bicolor see Oecomys bicolor Tomes, 1860
           12 Oryzomys bombycinus Goldman, 1912 - silky rice rat see Oryzomys bolivaris J. A. Allen, 1901
           13 Oryzomys buccinatus (Olfers, 1818)
           14 Oryzomys caliginosus - dusky rice rat see Melanomys caliginosus Tomes, 1860
           15 Oryzomys capito (Olfers, 1818)
           16 Oryzomys caudatus see Oryzomys chapmani Thomas, 1898
           17 Oryzomys chacoensis see Oligoryzomys chacoensis Myers & Carleton, 1981
           18 Oryzomys cleberi see Oecomys cleberi Locks, 1981
           19 Oryzomys concolor see Oecomys concolor Wagner, 1845
           20 Oryzomys couesi (Alston, 1877) - Coues' rice rat
           21 Oryzomys delicatus
           22 Oryzomys delticola Thomas, 1917 see Oligoryzomys delticola Thomas, 1917
           23 Oryzomys dimidiatus Thomas, 1905 - Thomas's water rat
           24 Oryzomys flavescens (Waterhouse, 1837) see Oligoryzomys flavescens Waterhouse, 1837
           25 Oryzomys fulgens Thomas, 1893 - Thomas's rice rat
           26 Oryzomys fulvescens (Saussure, 1860) - pygmy rice rat see Oligoryzomys fulvescens Saussure, 1860
           27 ‡Oryzomys galapagoensis Waterhouse, 1839
           28 Oryzomys gorgasi Hershkovitz, 1971
           29 Oryzomys hammondi Thomas, 1913
           30 Oryzomys intectus Thomas, 1921 see Handleyomys intectus (Thomas, 1921)
           31 Oryzomys kelloggi Avila-Pires, 1959
           32 Oryzomys lamia Thomas, 1901
           33 Oryzomys longicaudatus see Oligoryzomys longicaudatus (Bennett, 1832)
           34 Oryzomys macconnelli Thomas, 1910
           35 Oryzomys melanostoma
           36 Oryzomys melanotis Thomas, 1893 - black-eared rice rat see Handleyomys melanotis (Thomas, 1893)
           37 Oryzomys microtis J. A. Allen, 1916 see Oligoryzomys microtis J. A. Allen, 1916
           38 Oryzomys minutus see Microryzomys minutus Tomes, 1860
           39 Oryzomys munchiquensis
           40 Oryzomys nelsoni Merriam, 1898 - Nelson's rice rat
           41 Oryzomys nigripes see Oligoryzomys nigripes Olfers, 1818
           42 Oryzomys nitidus Thomas, 1884
           43 Oryzomys palustris (Harlan, 1837) - marsh rice rat
           44 Oryzomys polius Osgood, 1913
           45 Oryzomys ratticeps (Hensel, 1873)
           46 Oryzomys rivularis see Oryzomys bolivaris J. A. Allen, 1901
           47 Oryzomys robustulus see Melanomys robustulus Thomas, 1914
           48 Oryzomys spodiurus
           49 Oryzomys subflavus Wagner, 1842
           50 Oryzomys talamancae J. A. Allen, 1891
           51 Oryzomys utiaritensis J. A. Allen, 1916
           52 ‡Oryzomys victus - St Vincent rice rat see Oligoryzomys victus Thomas, 1898
           53 Oryzomys xantheolus Thomas, 1894
           54 Oryzomys yunganus Thomas, 1902
           55 Oryzomys zunigae see Melanomys zunigae Sanborn, 1949