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 ( Micoureus ) perplexa Anthony, 1922 TYPE MATERIAL AND TYPE LOCALITY: AMNH 47188, the holotype by original designation, consists of the skin and skull of a young adult female collected at Punta Santa Ana ( 3.83° S , 79.55° W ; 1113 m ), Loja province , Ecuador . SYNONYMS: None. DISTRIBUTION: Marmosa perplexa is known from the Pacific lowlands and western Andean foothills of southwestern Ecuador ( El Oro , Loja ) and northwestern Peru ( Cajamarca , Tumbes ) (Voss and Giarla, 2021: fig. 2). REMARKS: This species has long been treated as a synonym of Marmosa phaea , which it externally resembles. However, M. perplexa and M. phaea are not sister taxa, they have highly divergent mtDNA sequences, and they differ in several details of craniodental morphology (Voss and Giarla, 2021).