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 Marmosops Matschie, 1916
             01 Marmosops bishopi (Pine, 1981) - Bishop's slender opossum
             02 Marmosops cracens (Handley & Gordon, 1979) - narrow-headed slender opossum
             03 Marmosops dorothea (Thomas, 1911) - Dorothys' slender opossum
             04 Marmosops fuscatus (Thomas, 1896) - dusky slender opossum
             05 Marmosops handleyi (Pine, 1981) - Handley's slender opossum
             06 Marmosops impavidus (Tschudi, 1845) - Tschudi's slender opossum
             07 Marmosops incanus (Lund, 1840) - gray slender opossum
             08 Marmosops invictus (Goldman, 1912) - Panama slender opossum
             09 Marmosops juninensis (Tate, 1931) - Junin slender opossum
             10 Marmosops neblina Gardner, 1990 - Neblina slender opossum
             11 Marmosops noctivagus (Tschudi, 1844) - white-bellied slender opossum
             12 Marmosops parvidens (Tate, 1931) - delicate slender opossum
             13 Marmosops paulensis (Tate, 1931) - Brazilian slender opossum
             14 Marmosops pinheiroi (Pine, 1981) - Pinheiro's slender opossum