Lutreolina is a genus of opossum found in South America. Both extant species in this genus are known as lutrine opossums. They have an otter-like body plan and occasionally semiaquatic tendencies, hence the genus name Lutreolina, which is Latin for "otter-like".
Formerly, only one species, the big lutrine opossum (previously known as just the lutrine opossum) was recognized, but a 2014 study described a second species, Lutreolina massoia, on genetic and morphological grounds.[1]
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Juan A. Martínez-Lanfranco , David Flores , J. Pablo Jayat , and Guillermo D'Elía, A new species of lutrine opossum, genus Lutreolina Thomas (Didelphidae), from
the South American Yungas, Source: Journal of Mammalogy, 95(2):225-240. 2014.