Myotis oxyotus (Peters, 1866)

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 oxyotus (Peters, 1866)


Myotis oxyotus (Peters, 1866)


Among all Myotis specimens from Argentina analyzed, only one voucher was identified as M. oxyotus (CML 10860). It is a medium-sized bat (FA 40.9 mm, body mass 4.0 g; Table 5 View Table 5 ; Fig. 10 View Figure 10 ), with silky long fur (LDF 9.5 mm, LVF 7.5 mm). Ears comparatively short (length 19 mm). Dorsal fur strongly bicolored, with Blackish Brown bases (2/3 hair length) and Dresden Brown tips (1/3 hair length). The ventral fur strongly bicolored, with Blackish Brown bases and Light Grayish Olive tips. Membranes and ears are Mummy Brown. Legs and dorsal surface of uropatagium naked. A fringe of hairs along the trailing edge of the uropatagium absent. The plagiopatagium attached to feet on the level of the base of the toes by a wide band of membrane. The skull is large in size (GLS 14.83 mm, BCB 6.97 mm), and the rostrum comparatively short and narrow. The P3 is smaller than P2 and aligned in the toothrow and visible in labial view. Sagittal crest and lambdoidal crests very low. Parietals decay steeply to frontal bone; occipital region rounded and slightly projected beyond the occipital condyle limits; braincase globular in dorsal view; the postorbital and interorbital constrictions comparatively wide.

Myotis oxyotus is divided in two allopatric subspecies: Myotis o. oxyotus from South America and M. o. gardneri from Central America. Myotis o. oxyotus occurs along the Andes, from Venezuela southward to northern Argentina ( Wilson 2008; Moratelli et al. 2019a). The only specimen recorded for Argentina is from El Mirador, 1 km NW Yavi (Yavi Department, Jujuy Province, 22°07′41″S, 65°27′58″W; 3,450 m a.s.l.), in Puna ecoregion ( Urquizo et al. 2017)