Chacodelphys formosa (Shamel, 1930b:311)

Chacoan pygmy opossum



Taxonomy & Nomenclature

Synonym/s: Marmosa muscula Shamel, 1930b


Conservation Status

Last record: 1920

Rediscovered in 2004

IUCN RedList status: Vulnerable



Chaco Province, Formosa Province & Misiones Province, Argentina (northern)


Biology & Ecology




Holotype: USNM 236330 (skin and skull of a young adult male) (Voss, 2022:41)

Type locality: "Estancia Linda Vista (25.22° S, 59.78° W; ca. 100 m) on the Riacho Pilagá, Formosa province, Argentina" (Voss, 2022:41)






Original scientific description:

Shamel, H. H. (1930b). A new name for Marmosa muscula Shamel. Journal of Mammalogy 11: 311.


Other references:

Díaz-Nieto, Juan F.,  Jansa, Sharon A. and Voss, Robert S. (2016). Phylogenetic relationships of Chacodelphys (Marsupialia: Didelphidae: Didelphinae) based on “ancient” DNA sequences. Journal of Mammalogy 97(2): 394-404.

Fisher, Diana O. (2011). Trajectories from extinction: where are missing mammals rediscovered? Global Ecology & Biogeography 20: 415-425. [Appendix S1]

Gardner, A. L. and Creighton, G. K. (1989). A new generic name for Tate's microtarsus group of South American mouse opossums (Marsupialia: Didelphidae). Proceedings of the Biological Society of Washington 102: 3-7.

Sauthier, Daniel Edgardo Udrizar and Carrera, Marcelo. (2013). Nuevos registros de micromamíferos (Rodentia, Chiroptera y Didelphimorphia) del Chaco Oriental, Argentina. Historia Natural 3(2): 51-60.

Scheffers, Brett R., Yong, Ding Li, Harris, J. Berton C., Giam, Xingli and Sodhi, Navjot S. (2011). The world’s rediscovered species: back from the brink? PLoS ONE 6(7): e22531. [Supporting Information (Table S1)]

Shamel, H. H. (1930a). A new murine opossum from Argentina. Journal of the Washington Academy of Sciences 20: 83-84.

Tate, G. H. H. (1933). A systematic revision of the marsupial genus Marmosa with a discussion of the adaptive radiation of the murine opossums (Marmosa). Bulletin of the American Museum of Natural History 66: 1-250.

Teta, P. and Pardiñas, U. F. J. (2007). Mammalia, Didelphimorphia, Didelphidae, Chacodelphys formosa (Shamel, 1930): range extension. Check List 3(4): 333-335.

Teta, P., Pardiñas, U. F. J. and D’Elía, G. (2006). Rediscovery of Chacodelphys: A South American marsupial genus previously known from a single specimen. Mammalian Biology 71(5): 309-314.

Voss, Robert S. (2022). An annotated checklist of recent opossums (Mammalia: Didelphidae). Bulletin of the American Museum of Natural History 55: 1-74, 4 tbls.

Voss, Robert S., Gardner, A. L. and Jansa, S. A. (2004). On the relationships of "Marmosa" formosa Shamel 1930 (Marsupialia, Didelphidae), a phylogenetic puzzle from the chaco of northern Argentina. American Museum Novitates 3442: 1-18.;2


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