Thylamys citellus, commonly known as the Mesopotamian fat-tailed opossum (or comadreja litoraleña in Spanish), is a small, nocturnal marsupial belonging to the family Didelphidae. Native to the Mesopotamian region of South America,R. Eduardo Palma, Dusan Boric Bargetto, Pablo Jayat, David A. Flores et a.: Molecular phylogenetics of mouse opossums: new findings on the phylogeny of Thylamys (Didelphimorphia, Didelphidae). Zoologica Scripta 43(3):217-234 · Januar 2014, PDF this species was historically grouped as a subspecies or synonym of the common fat-tailed mouse opossum (Thylamys pusillus), but genetic and morphological revisions have firmly established it as its own distinct, monotypic species.Diego Astúa: Family Didelphidae (Opossums). in Don E. Wilson, Russell A. Mittermeier: Handbook of the Mammals of the World – Volume 5. Monotremes and Marsupials. Lynx Editions, 2015, ISBN 978-84-96553-99-6. Seite 177.
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