Cryptonanus guahybae ( Tate, 1931 )

Voss, Robert S., 2022, An Annotated Checklist Of Recent Opossums (Mammalia: Didelphidae), Bulletin of the American Museum of Natural History 2022 (455), pp. 1-77 : 42

Cryptonanus guahybae ( Tate, 1931)

TYPE MATERIAL AND TYPE LOCALITY: ZMB 4306 , the holotype by original designation, consists of the skin and skull of an adult male collected on the island of “Guahyba” (= Ilha Guaíba ; ca. 30.10° S, 53.75° W; at sea level) near Pôrto Alegre, Rio Grande do Sul state, Brazil .

SYNONYMS: None.

DISTRIBUTION: Cryptonanus guahybae occurs in a variety of subtropical habitats—including grasslands, seasonally flooded forests, deciduous forests, Araucaria forest, and coastal scrub—in southern Brazil ( Fegies et al., 2021: fig. 1) and possibly also in Uruguay (see Remarks).

REMARKS: For an emended description see Voss et al. (2005), Quintela et al. (2011), and Dias et al. (2016), all of whom also tabulated measurement data for this species. Phylogenetic analyses of multilocus sequence data suggest that specimens referable to Cryptonanus guahyba e include members of two morphologically cryptic, allopatric phylogroups, one of which occupies the Atlantic coastal plain and the other the interior highlands of Rio Grande do Sul ( Fegies et al., 2021). The identity of the Uruguayan specimens reported by D’Elía and Martínez, 2006) has yet to be determined, but some of them could be C. guahybae .