Sirenia (Trichechidae), Illiger, 1811

Voss, Robert S. & Fleck, David W., 2017, Mammalian Diversity And Matses Ethnomammalogy In Amazonian Peru Part 2: Xenarthra, Carnivora, Perissodactyla, Artiodactyla, And Sirenia, Bulletin of the American Museum of Natural History 2017 (417), pp. 1-1 : 1-

Sirenia (Trichechidae)

The Amazonian manatee ( Tichechus inunguis ) occurs—or formerly occurred—along the margins of the Yavarí-Ucayali interfluve and in some of its interior waterways, but it does not occur in Matses tribal territory, and its habits are not known to the Matses, who traditionally avoided major rivers.