Myotis nimbaensis , new species Nimba Myotis Figures 3–8 HOLOTYPE: AMNH 279589, an adult male captured and released on 26 January 2018 at Kaiser Adit 3 and then collected on 2 February 2018 by Jon Flanders and Eric Moïse Bakwo Fils at Kaiser Adit 1 (fig. 2), Nimba Mountains, Guinea (N07.66499, W008.37223), field number BCIGU133. The specimen was preserved whole in formalin and stored in ethanol, and the skull was subsequently extracted and cleaned. A 3 mm wing biopsy tissue sample was collected and stored in desiccant before the DNA was extracted at CIBIO-InBIO, University of Porto, Portugal. PARATYPE: AMNH 279590, an adult female collected at the same time and place as the holotype, field number BCIGU132. Like the holotype, the paratype was preserved in formalin and stored in ethanol after a 3 mm wing biopsy tissue sample was collected and stored in desiccant before the DNA was extracted. The skull was subsequently extracted and cleaned. OTHER RECORDS: In addition to the captures of the holotype and paratype, we recorded echolocation calls from the male holotype on 26 January 2018. Once its distinctive call parameters were identified, we searched for its echolocation call signature in sound files recorded at the entrances of 10 mine adits between 2018–2019, including the type locality, within the Nimba Mountains’ Mining Concession in Guinea (fig. 1), using Song Meter SM4BAT acoustic detectors (Wildlife Acoustics). Echolocation calls closely matching those recorded from the release calls of the holotype were detected at the entrances of a total of five mine adits (fig. 1) with seasonal variation between sites and the highest activity rates recorded at the type locality. While the Nimba Mountains support an exceptionally diverse bat fauna, this is the first Myotis species observed using the adits and only the second Myotis species to be recorded across the whole mountain range (Monadjem et al., 2016). Details of call frequency and structure, as well as comparisons with calls of congeneric species, are provided ...