Class Mammalia Linnaeus, 1758 - mammals
   Subclass Theria Parker & Haswell, 1897
     Order Didelphimorphia Gill, 1872
       Family Didelphidae Gray, 1821 - American opossums
         Subfamily Didelphinae Gray, 1821
           Genus Tlacuatzin Voss & Jansa, 2003 [monotypic]
             Tlacuatzin canescens (Allen, 1893) - gray mouse opossum
               [Tlacuatzin canescens canescens]ᵀ (Allen, 1893)