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 albescens ( E . Geoffroy, 1806) Comments. Medium-sized species (FA 33.5-37.5 mm, body mass 4-8 g; Table 4 , Fig. 5 ), with silky, moderately long fur (LDF 5-8 mm, LVF 4-6 mm). Ears comparatively short (length 12-15 mm). Dorsal fur Mummy Brown from basis almost to the tip (ca. 4/5 of hairs length); tips (ca. 1/5) Antimony Yellow or paler usually strongly contrasting with the basal color, giving a yellowish or grayish frosting appearance. Yellowish tips can be less evident in a few specimens in which the dorsal fur seems nearly unicolored (especially in northeastern Argentina). Ventral fur strongly bicolored, with blackish bases (2/3 hair length) and whitish tips (1/3 hair length). Ventral fur often becomes progressively paler (whiter) from upper thorax to pelvic region. Membranes and ears Mummy Brown. Legs and dorsal surface of uropatagium naked. Fringe of hairs along the trailing edge of the uropatagium always present. Plagiopatagium attached to feet on the level of the base of the toes by a wide band of membrane. Skull moderate in size (GLS 13.8-15.2 mm, BCB 6.8-7.3 mm), rostrum comparatively short and broad, and frontal bone strongly sloping. P3 smaller than P2 and usually aligned to the toothrow, and visible in labial view. Sagittal crest absent; lambdoidal crests usually present and ranging from low to medium. Parietals slope anteriorly; occipital region rounded and projecting beyond the occipital condyle limits; braincase globular in dorsal view; postorbital and interorbital constrictions comparatively wide. Table 4. External and craniodental measurements of Argentinean populations of Myotis albescens , M. ruber , and M. nigricans , including morphometric variation and number of samples (N). The measurements are in millimeters. Acronyms and descriptions are available in Table 1 .

Measurements	Myotis albescens	Myotis ruber	Myotis nigricans
	mean (min-max) N	mean (min-max) N	mean (min-max) N
FA	35.0 (33.7-36.8) 22	38.5 (37.5-40.5) 5	33.8 (33.0-35.0) 7
EL	14.0 (12.0-15.5) 22	14.2 (13.0-15.0) 4	13.0 (11.0-15.0) 7
Body mass	6.0 (5.5-7.0) 18	7.0 (4.0-8.0) 4	4.5 (3.5-6.0) 7
LDF	6.5 (5.5-7.5) 17	7.0 (6.5-8.0) 4	7.0 (6.0-7.5) 7
LVF	5.0 (4.5-6.0) 17	5.5 (5.0-6.0) 4	5.5 (5.0-6.5) 7
GLS	14.3 (13.9-15.0) 20	15.3 (15.1-15.6) 5	13.5 (12.4-14.3) 7
CCL	12.7 (12.1-14.2) 20	13.5 (13.5-13.7) 5	12.0 (11.6-12.7) 7
CBL	13.1 (12.6-13.8) 20	14.2 (14.0-14.4) 5	12.7 (12.3-13.5) 7
CIL	13.4 (12.9-14.0) 20	14.5 (14.4-14.8) 5	12.8 (12.4-13.5) 7
BAL	12.1 (11.5-13.4) 20	13.0 (12.8-13.2) 5	11.5 (11.0-12.3) 7
ZYG	8.8 (8.6-9.0) 11	9.5 (9.4-9.6) 3	8.3 (8.1-8.4) 4
MAB	7.4 (7.0-7.7) 20	7.8 (7.7-8.2) 5	6.9 (6.6-7.1) 7
BCB	7.1 (6.8-7.4) 20	7.0 (6.7-7.2) 5	6.4 (6.2-6.6) 7
POB	4.1 (3.9-4.2) 20	3.7 (3.6-3.9) 5	3.5 (3.3-3.8) 7
IOB	4.8 (4.5-5.0) 20	4.9 (4.7-5.2) 5	4.5 (4.1-4.7) 7
BAC	3.8 (3.5-4.0) 20	4.1 (4.0-4.3) 5	3.4 (3.2-3.5) 5
BAM	5.5 (5.2-5.7) 20	6.0 (5.8-6.2) 5	5.2 (4.9-5.6) 7
MTL	5.1 (4.9-5.5) 20	5.9 (5.9-5.9) 5	5.0 (4.8-5.2) 7
M1-3	2.9 (2.8-3.1) 20	3.3 (3.2-3.3) 5	2.8 (2.7-3.0) 7
MAN	5.8 (5.1-6.1) 20	6.3 (6.2-6.4) 4	5.3 (5.1-5.5) 7
MAL	10.0 (9.5-10.4) 20	11.1 (10.9-11.4) 4	9.4 (9.0-9.7) 7

Figure 5. Adult female of Myotis albescens (CML 5108) from Salta, Argentina. Occurs from southern Veracruz, Mexico, southward through Central America into Uruguay, northern Argentina and eastern Brazil, from humid tropical forests to savannas and semi-arid environments ( Braun et al. 2009 ; Moratelli and Oliveira 2011 ; Moratelli et al. 2019a ; Diaz et al. 2021 ). In Argentina, it occurs in Northwestern (Provinces of Jujuy, Salta, and Tucuman ), Gran Chaco (Chaco, Formosa, and Santiago del Estero Provinces), Littoral regions (Provinces of Corrientes, Entre Rios , and Misiones), and the Pampa area (Buenos Aires Province) ( Barquez and Diaz 2020 ), from humid forests (Southern Andean Yungas) to scrublands (Dry Chaco) in an altitudinal range from 5 to 1,400 m.