Small Mammals of the Mayo River Basin in Northern Peru, with the Description of a New Species of Sturnira (Chiroptera: Phyllostomidae)

Abstract

We present the results of an inventory of small mammals in the Mayo River basin, one of the least-studied regions of the Central Andes in Peru. We conducted inventories at three locations in May 2007. We collected 47 species of small mammals in the study area: five marsupials, 31 bats, and 11 rodents. A new species of Sturnira was encountered and is described. The new species, which was previously confused with S. lilium, occurs east of the Andes in Colombia, Ecuador, Peru, Bolivia, Venezuela, the Guianas, and Brazil, with an isolated record on the western slope of the Andes in Peru. Additionally, we report the presence of Anoura geoffroyi in Peru, Carollia sp. sensu Solari and Baker (2006) south of the Maranon River, and extend the elevational range of Neacomys spinosus and Oligoryzomys destructor. Our results highlight the need to conduct additional inventories to increase our understanding of the biodiversity of this rich and increasingly impacted region. VELAZCO AND PATTERSON: SMALL MAMMALS OL THE MAYO RIVER BASIN, PERU 7 Condyloincisive length (CIL): From the posteriormost point on the occipital condyles to the anteriormost point on the upper incisors. Condylocanine length (CCL): From the posteriormost point on the occipital condyles to the anteriormost point on the upper canines. Lacrimal breadth (LB): Greatest breadth across the lacrimal (= anteorbital) ridges, when present and well defined. Postorbital breadth (POB): Least breadth across the frontals posterior to the postorbital pro¬ cesses or bulges. Zygomatic breadth (ZB): Greatest breadth across the zygomatic arches. Braincase breadth (BCB): Greatest breadth of the globular part of the braincase. Mastoid breadth (MB): Greatest cranial breadth across the mastoid region. Maxillary toothrow length (MTR): From the ante¬ riormost edge of the canine crown to the posteriormost edge of the crown of M3. Breadth across molars (BM): Greatest breadth across the outer edges of the crowns of the upper molars. Breadth across canines (BC): Greatest breadth across the outer edges of the crowns of the upper canines. Dentary length (DENL): Distance from midpoint of condyle to the anteriormost point of dentary. Mandibular toothrow length (MANDL): Distance from anteriormost surface of the lower canine to the posteriormost surface of m3.We follow Davalos et al. (2014; MorphoBank project 891, http://dx.doi.org/10.7934/P891) in assigning homology for bat premolars. When three upper premolars are present (e.g., Anoura), the first upper premolar corresponds to PI, the second to P4, and the third one to P5. If only two are present (e.g., Lophostoma) these correspond to P4 and P5 and if only one is present (e.g., Desmodus) it corresponds to P5. The lower premolar homologies are not as straightforward as those of the upper premolars. When three lower premo¬ lars are present (e.g., Glossophaga, Thyroptera)these correspond to pi, p4 and p5, but if only two are present in some cases they apparently corre¬ spond to pi and p5 (e.g., Artibeus, Sturnira, Uroderma) whereas in other cases ...

Small mammals from the Seasonally Dry Tropical Forests of the Huallaga river basin and new records for San Martín department, Peru

“…Myotis simus 1 1 Osgood (1914), Thomas (1927), Voss et al (2018), this study ORDER RODENTIA Family Cricetidae 17 Auliscomys pictus Ma Leo and Romo (1992) 18 Akodon aerosus Be, Mo, Ri Osgood (1914), Thomas (1927), Velazco and Patterson (2019), this study 19 Akodon orophilus VU Ma, Mo, Ri Leo and Romo (1992), Osgood (1913), Jiménez et al (2013) 20 Euryoryzomys macconnelli Mo Velazco and Patterson (2019) 21 Euryoryzomys nitidus Be, Mo, Ri Osgood (1914), Thomas (1927), MUSM 46541…”

“…22 Holochilus sciureus Mo, Ri Thomas (1927), Gonçalves et al (2015), Velazco and Patterson (2019) 23 Hylaeamys perenensis Be, Do, Mo, Pi, Ri Velazco and Patterson (2019) Osgood (1914), Leo and Romo (1992), Hurtado and Pacheco (2017) 29 Nectomys apicalis Be, Pi, Ri, Sn Thomas (1927), Chiquito and Percequillo (2019) Thomas (1924), Thomas (1927) 36 Oligoryzomys destructor Mo, Ri Osgood (1914), Thomas (1927), Velazco and Patterson (2019) 37 Osgood (1914), LaVal (1973 129 Myotis oxyotus La, Ma, Ri Acha and Zapatel (1957), Koopman (1978), Solari et al (2001) 130 Marmosa constantiae* x…”

“…This lack of information is of great concern because San Martín is one of the most deforested departments in Peru (MINAM 2020). Previous extensive studies in this department are scarce and had been carried out mostly in the Río Abiseo National Park (Leo and Romo 1992;Gardner and Romo 1993;Leo and Gardner 1993) and the Mayo river basin (Velazco and Patterson 2019), which are located in montane and humid lowland forests, respectively.…”

Diversidad y estado de conservación de pequeños mamíferos de Loreto, Perú

“…Nectomys rattus es conocida en el Perú por escasos cuatro a cinco registros distribuidos en los departamentos de San Martín, Loreto y Ucayali , Velazco & Patterson 2019. En Loreto, solo se conoce de dos registros en la provincia de Alto Amazonas a partir de individuos colectados en 1912.…”

“…En el Perú, políticamente, los bosques amazónicos se ubican en los departamentos de Loreto, Ucayali y Madre de Dios, y en parte en los departamentos de Amazonas, San Martín, Huánuco, Pasco, Junín, Cusco y Puno. En todos ellos se han realizado importantes inventarios sobre la diversidad de mamíferos (Thomas 1926;Thomas 1927a;Thomas 1927b;Thomas 1928b;Woodman et al 1991;Pacheco et al 1992;Hutterer et al 1995;Soini et al 1996;Pacheco & Arias 2001;Figueroa 2004, Solari et al 2006Jorge & Velazco 2006;Pacheco et al 2011;Aquino et al 2012a;Castro 2012;Arias et al 2016;Mena & Germana 2016;Ruelas et al 2018;Velazco & Patterson 2019, Velazco et al 2021. Además, se han elaborado listas de todos los mamíferos para los departamentos de Loreto y Ucayali, en los que se indica la ocurrencia de 191 y 267 especies, respectivamente (Quintana et al 2009;Pitman et al 2013).…”