Class Mammalia Linnaeus, 1758 - mammals
   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 dryas (Thomas, 1898) - wood sprite gracile opossum
           4 Gracilinanus emiliae (Thomas, 1909) - Emilia's gracile opossum
           5 Gracilinanus marica (Thomas, 1898) - northern gracile opossum
           6 Gracilinanus microtarsus (Wagner, 1842) - Brazilian gracile opossum