Mammalian Diversity And Matses Ethnomammalogy In Amazonian Peru Part 2: Xenarthra, Carnivora, Perissodactyla, Artiodactyla, And Sirenia Author Voss, Robert S. Author Fleck, David W. text Bulletin of the American Museum of Natural History 2017 2017-10-27 2017 417 1 1 http://www.bioone.org/doi/10.1206/00030090-417.1.1 journal article 10.1206/00030090-417.1.1 0003-0090 5407771 Trichechus inunguis (Natterer, 1883) VOUCHER MATERIAL: Río Tapiche (AMNH 98691). OTHER INTERFLUVIAL RECORDS: Jenaro Herrera (Tovar, 2011), Reserva Comunal Tamshiyacu-Tahuayo ( Bodmer, 1994 ), Río Orosa (Mármol, 1995), Río Tapiche (Reeves et al., 1996), Río Yavarí (Mármol, 1995). IDENTIFICATION: Only a single species of manatee is known to occur in the upper Amazon Basin. Our voucher consists of the skull of a mature adult of unknown sex. Selected cranial measurements of AMNH 98691 are all within the range of variation for Trichechus inunguis tabulated by Domning and Hayek (1986) : condylobasal length, 383.1 mm ; breadth across postorbital processes of frontals, 130.1 mm ; least postorbital breadth, 54.1 mm ; zygomatic breadth, 214.1 mm . REMARKS: The holotype skull of an allegedly new species of “dwarf ” manatee recently described by Roosmalen (2015: figs. 20, 21) from the Rio Aripuanã basin of Amazonas, Brazil , is an obviously immature individual with open basicranial and occipital sutures.