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 Genus Cryptonanus Voss et al., 2005 TYPE SPECIES: Marmosa agilis chacoensis Tate, 1931 , by original designation. SYNONYMS: None. REMARKS: See Voss and Jansa (2009) for an emended generic description. Phylogenetic analyses of multilocus sequence datasets strongly support generic monophyly and convincingly recover Cryptonanus and Chacodelphys as sister taxa in a larger clade that includes Gracilinanus , Lestodelphys , and Thylamys , but not Marmosops ( Díaz-Nieto et al., 2016a ; Fegies et al., 2021 ). Of the five species originally referred to Cryptonanus by Voss et al. (2005) , only four are now recognized as valid. Currently recognized species of Cryptonanus are all from south of the Amazon (in Brazil , Paraguay , Bolivia , Uruguay , and Argentina ), but specimens of a possibly undescribed species have been reported from Amapá ( Silva et al., 2013 ) and French Guiana (Baglan and Catzeflis, 2016).