Argentinean Myotis (Chiroptera, Vespertilionidae), including the description of a new species from the Yungas Author Novaes, Roberto Leonan M. https://orcid.org/0000-0003-1657-2807 Fundacao Oswaldo Cruz, Fiocruz Mata Atlantica, 22713 - 375, Rio de Janeiro, RJ, Brazil robertoleonan@gmail.com Author Claudio, Vinicius C. https://orcid.org/0000-0002-3438-911X Universidade Federal do Rio de Janeiro, Instituto de Biologia, Programa de Pos-Graduacao em Biodiversidade e Biologia Evolutiva, 21941 - 902, Rio de Janeiro, RJ, Brazil Author Diaz, M. Monica https://orcid.org/0000-0001-9519-6461 Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET); Universidad Nacional de Tucuman, Facultad de Ciencias Naturales, Instituto de Investigaciones de Biodiversidad Argentina; and Fundacion Miguel Lillo 251, 4000, Tucuman, Argentina Author Wilson, Don E. https://orcid.org/0000-0003-4228-5334 Smithsonian Institution, National Museum of Natural History, 20560, Washington, DC, USA Author Weksler, Marcelo Museu Nacional da Universidade Federal do Rio de Janeiro, Departamento de Vertebrados, 20940 - 040, Rio de Janeio, RJ, Brazil Author Moratelli, Ricardo https://orcid.org/0000-0003-0942-6633 Fundacao Oswaldo Cruz, Fiocruz Mata Atlantica, 22713 - 375, Rio de Janeiro, RJ, Brazil text Vertebrate Zoology 2022 2022-12-14 72 1187 1216 http://dx.doi.org/10.3897/vz.72.e90958 journal article http://dx.doi.org/10.3897/vz.72.e90958 2625-8498-72-1187 F856EE991746498CBA152D34A3EEE979 DDDD7D4212E25E21A162EF3D08B19D0D Myotis chiloensis (Waterhouse, 1840) Comments. Medium to large-sized species (FA 37.0-41.2 mm, body mass 5.5-9.5 g; Table 5 ; Fig. 9 ), with wolly, long fur (LDF 6.0-8.5 mm, LVF 5.0-7.5 mm). Ears comparatively short (length 14-16 mm). Dorsal fur subtly bicolored, with medium-brown bases (near Mummy Brown) and tips generally Brussels Brown or Cinnamon Brown. The ventral fur is strongly bicolored, with Mummy Brown bases (2/3 hair length) and Dresden Brown tips (1/3 hair length). Membranes and ears Mummy Brown. Legs and dorsal surface of uropatagium naked. The few hairs on the trailing edge of the uropatagium do not constitute the fringe of hairs characteristic of other species, such as M. albescens . The plagiopatagium attached to feet on the level of the base of the toes by a wide band of membrane. Skull medium to large in size (GLS 13.8-15.3 mm, BCB 6.3-7.4 mm), and the rostrum comparatively long and narrow. The P3 is approximately the same size than P2, aligned in the toothrow, and visible in labial view. Sagittal crest absent or, when present, very low; lambdoidal crests present and low. Parietals decay subtly forward to frontal bone; occipital region projects beyond the occipital condyle limits; braincase elongated in dorsal view; the postorbital and interorbital constrictions are comparatively narrow. Figure 9. Adult female of Myotis chiloensis (MACN 16524) from Chubut, Argentina. Myotis chiloensis occurs from Southern Chile, eastward into western Argentina and southward to Tierra del Fuego, in evergreen-deciduous forests, montane temperate forests, and Patagonian scrublands ( Ossa and Rodriguez-San Pedro 2015 ; Moratelli et al. 2019a ). In Argentina, it is present in the Provinces of Neuquen , Rio Negro, Chubut, Santa Cruz, and Tierra del Fuego, in Valdivian Temperate Forests, Patagonian Steppes, and Magellanic Subpolar Forests in an altitudinal range from sea level to ca. 1,000 m.