Small mammals from the Seasonally Dry Tropical Forests of the Huallaga river basin and new records for San Martín department, Peru Author Ruelas, Dennisse Author Pacheco, Victor text Check List 2021 2021-06-07 17 3 877 894 http://dx.doi.org/10.15560/17.3.877 journal article 10.15560/17.3.877 1809-127X Myotis simus Thomas, 1901 Figure 4T Material examined. PERU • El Quinillal private conservation area, Bellavista Province ; 07°04′15″S , 076°23 ′ 59″W; 316 m elevation; 01.IX. 2015 ; D. Ruelas leg.; mist nets; 1 ♀ , MUSM 43884, adult. Identification. The following combination of morphological characters distinguishes this species: relatively short conical face that lacks skin folds or appendages; relatively small eyes, small ears; thin and elongated tail fully embedded within the uropatagium reaching the free edge and longer than the hind legs; short ears, ex- tending forward halfway from the eye to nostril; barely evident antitragal notch; pointed tragus, slightly curving outward above and convex below, with a small triangu- lar lobule at the outer base; naked dorsally uropatagium without a fringe of hairs along the trailing edge; few scattered hairs on the basal portion of the uropatagium; calcar with a small keel; third upper premolar crowded to lingual side; sagittal and occipital crests present. These characters agree with those described by Moratelli (2012) and Díaz et al. (2016) and are in agreement with specimens in the MUSM collection ( Ucayali Department: MUSM 24593, 30022, 40490, 44223). We present exter- nal measurements in Table 2 . Remarks. Myotis simus occurs from the Amazon basin of Colombia , Bolivia , Brazil , Ecuador , Peru , and farther south to Argentina and Paraguay ( Wilson 2008 ). In Peru , M. simus ocurrs in the Yungas and Selva Baja ecoregions ( Pacheco et al. 2009 ). The new record of extends this species’ geographic range by 410 km northwest of the nearest previous record at Oxapampa, Pasco department ( Wilson 2008 ). Additional to these five species, we confirmed the pres- ence of two rare species in San Martín department.