Class Mammalia Linnaeus, 1758 - mammals
   Order Rodentia Bowdich, 1821 - rodents
     Suborder Sciurognathi (Tullberg, 1899) see Suborder Sciuromorpha Brandt, 1855
       Family Muridae Batsch, 1788 - rats, mice, hamsters, voles, lemmings, and gerbils
         Subfamily Sigmodontinae Wagner, 1843
           Genus Neusticomys Anthony, 1921 - fish-eating rats
             1 Neusticomys monticolus Anthony, 1921 - fish-eating mouse
             2 Neusticomys mussoi Ochoa G. & Soriano, 1991
             3 Neusticomys oyapocki Dubost & Petter, 1978
             4 Neusticomys peruviensis Musser & Gardner, 1974 - Peruvian fish-eating rat
             5 Neusticomys venezuelae (Anthony, 1929) - Venezuelan fish-eating rat