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 Gracilinanus Gardner & Creighton, 1989
             1 Gracilinanus aceramarcae (Tate, 1931) - Aceramarca gracile opossum
             2 Gracilinanus agilis (Burmeister, 1854) - agile gracile opossum
             3 Gracilinanus agricolai (Moojen, 1943) - Agricola's gracile opossum
             4 Gracilinanus dryas (Thomas, 1898) - wood sprite gracile opossum
             5 Gracilinanus emiliae (Thomas, 1909) - Emilia's gracile opossum
             6 Gracilinanus formosus (Shamel, 1930) - pygmy opossum
             7 Gracilinanus ignitus Díaz, Flores & Barquez, 2002 - red-bellied gracile opossum
             8 Gracilinanus marica (Thomas, 1898) - northern gracile opossum
             9 Gracilinanus microtarsus (Wagner, 1842) - Brazilian gracile opossum