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1 January 2015 A second record of Myotis diminutus (Chiroptera: Vespertilionidae): its bearing on the taxonomy of the species and discrimination from M. nigricans
Ricardo Moratelli, Don E. Wilson
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Myotis diminutus Moratelli & Wilson, 2011a (Vespertilionidae, Myotinae) was known only from the holotype—a subadult collected in a fragment of moist forest on the western slope of the Ecuadorian Andes in 1979. Based on recent work in museum collections, we discovered a second specimen of Myotis diminutus, collected in 1959. This specimen of Myotis diminutus comes from La Guayacana, Nariño, western Colombia (≈ 135 km north from the type locality); and M. nigricans (Schinz, 1821) also was collected at the same locality. This record confirms the distinctiveness of Myotis diminutus. This species is known from only the Chocó ecoregion, one of the critical biodiversity hotspots on Earth. We have no evidence of living individuals. In this report we also investigate the relationships among Myotis nigricans from eastern and western sides of the Andes. Our results confirm that populations from both sides of the Cordillera represent the same subspecies—Myotis nigricans nigricans.

Myotis diminutus Moratelli & Wilson, 2011a era conocido sólo del holotipo—un subadulto coleccionado en un fragmento de bosque húmedo en la vertiente occidental de los Andes del Ecuador en 1979. Basado en un trabajo reciente en colecciones de museos, descubrimos un segundo ejemplar de Myotis diminutus, coleccionado en 1959 en La Guayacana, Nariño, Colombia (≈ 135 km al norte de la localidad tipo), la misma localidad donde individuos de M. nigricans (Schinz, 1821) fueron capturados. Este registro confirma el carácter distintivo de Myotis diminutus. Esta especie es conocida sólo de la ecoregión del Chocó, uno de los hotspots de biodiversidad más importantes del planeta. No hay evidencia de individuos vivos. Además, hemos analizado las relaciones entre poblaciones de Myotis nigricans de los diferentes lados de los Andes. Nuestros resultados confirman estas poblaciones como la misma subespecie—Myotis nigricans nigricans.

Ricardo Moratelli and Don E. Wilson "A second record of Myotis diminutus (Chiroptera: Vespertilionidae): its bearing on the taxonomy of the species and discrimination from M. nigricans," Proceedings of the Biological Society of Washington 127(4), 533-542, (1 January 2015).
Published: 1 January 2015

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diminutive Myotis
Myotis nigricans
Myotis punensis
western Colombia
western Ecuador
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