An Annotated Checklist Of Recent Opossums (Mammalia: Didelphidae) Author Voss, Robert S. text Bulletin of the American Museum of Natural History 2022 2022-04-04 2022 455 1 77 https://bioone.org/journals/bulletin-of-the-american-museum-of-natural-history/volume-455/issue-1/0003-0090.455.1.1/An-Annotated-Checklist-of-Recent-Opossums-Mammalia-Didelphidae/10.1206/0003-0090.455.1.1.full journal article 10.1206/0003-0090.455.1.1 0003-0090 Marmosa ( Exulomarmosa ) simonsi Thomas, 1899 TYPE MATERIAL AND TYPE LOCALITY: BMNH 99.8 .1.20, the holotype by original designation, consists of the skin and skull of an adult male collected at Puná ( 2.73° S , 79.92° W ; near sea level), on Isla Puná , Guayas province , Ecuador . SYNONYMS: None. DISTRIBUTION: Marmosa simonsi occurs in mangroves and dry forests of the Pacific lowlands and Andean foothills of western Ecuador and northwestern Peru ( Rossi et al., 2010 : fig. 28). REMARKS: See Rossi et al. (2010) for an emended description, tabulated measurement data, and morphological comparisons with congeneric species. Marmosa simonsi was long considered a synonym or subspecies of M. robinsoni (e.g., by Herskovitz, 1951; Creighton and Gardner, 2008a), but Rossi et al. (2010) and Gutiérrez et al. (2010) showed that these taxa are morphologically and genetically distinct.