Order: Didelphimorphia (Opossums)
Family: Didelphidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
Chacodelphys formosa | (Shamel, 1930) | Chacoan pygmy opossum | (rediscovered) | Formosa Province, Argentina | Rediscovered | |
Cryptonanus ignitus | Diaz, Flores and Barquez, 2002 | Red-bellied gracile (mouse) opossum | 28 March 1962 | Juyjuy, Argentina | Invalid (synonym) | |
Marmosa andersoni | Pine, 1972 | Heavy-browed mouse opossum, Anderson's mouse opossum | (rediscovered) | Peru | Rediscovered | |
Marmosops handleyi | (Pine, 1981) | Handley's slender mouse opossum | (rediscovered) | Cordillera Central, Antioquia, Colombia | Rediscovered | |
Marmosops juninensis | Tate, 1931 | Junín slender opossum | (rediscovered) | Junín Department, Peru | Rediscovered | Access |
| Monodelphis unistriata | Wagner, 1842 | One-striped opossum, One-striped short-tailed opossum, Single-striped opossum | 9 April 1899 | São Paulo state, Brazil & Provincía Misiones, Argentina | Missing | Access |