Myotis chiloensis (Waterhouse, 1840)

Novaes, Roberto Leonan M., Claudio, Vinicius C., Diaz, M. Monica, Wilson, Don E., Weksler, Marcelo & Moratelli, Ricardo, 2022, Argentinean Myotis (Chiroptera, Vespertilionidae), including the description of a new species from the Yungas, Vertebrate Zoology 72, pp. 1187-1216 : 1187

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Myotis chiloensis (Waterhouse, 1840)


Myotis chiloensis (Waterhouse, 1840)


Medium to large-sized species (FA 37.0-41.2 mm, body mass 5.5-9.5 g; Table 5 View Table 5 ; Fig. 9 View Figure 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.

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 Rodríguez-San Pedro 2015; Moratelli et al. 2019a). In Argentina, it is present in the Provinces of Neuquén, Río 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.