First record of Myotis riparius Handley , 1960 ( Chiroptera , Vespertilionidae ) in Sergipe , northeastern Brazil

Myotis riparius Handley, 1960 was captured in 2 areas of Atlantic Forest in Sergipe, in northeast Brazil, filling the gaps of occurrence of this species in the region. This record expands the richness of bats in the state to 55 species.


Methods
Two male adult specimens were collected in 2 areas of the Atlantic Forest in Sergipe, northeastern Brazil, by using mist nets (9 × 3 m, 20 mm mesh) which remained open from sunset and closed 6.5 hours later, with permission for capture and collection, numbers 54957-1 (SISBIO) and 032000-01737/2012-8 (SEMARH-SE).The first area, Refúgio de Vida Silvestre Mata do Junco, is located in the municipality of Capela and has an area of 1520 ha, characterized as a semideciduous forest that present as secondary forest remnants and open areas, being the region of the source of the Lagartixo river.Antropic actions in the area, such as the removal of trees, give the locality patches of vegetation in different stages of succession (Santos et al. 2007).The climate is megathermal subhumid and the surrounding matrix is composed of sugar cane plantations (Souza-Alves et al. 2014).The second area, Reserva Particular do Patrimônio Natural do Caju, is located in the south coast of Sergipe, in the municipality of Itaporanga D'Ajuda, and has an area of 763 ha (Braghini and Vilar 2013).The area presents a mosaic of vegetation of restinga, mangrove and hypersaline tidal flats (apicum) (EMBRAPA 2013).The vegetation of restinga forest is little dense, with trees reaching 15 m, developing in soil of marine quartz sands (Mélo Filho et al. 1982).The climate is tropical megathermal (Alvares et al. 2013) and the surrounding region is characterized by the shrimp farming, vegetable extractivism, and urban expansion (Braghini and Vilar 2013).
After capture, the specimens were fixed in 10% formalin and preserved in 70% alcohol.The skulls were removed and cleaned, and deposited in the Coleção de Mamíferos da Universidade Federal de Sergipe (CMUFS).The body and cranial measurements were obtained with a digital caliper with precision of 0.05 mm.The specimens were identified according to López-González et al. (2001), Wilson (2008), and Novaes et al. (2017).Identification.Each specimen presented a mediumsized body when compared to other Myotis species.They were typified by long woolly fur with weakly bicolored brownish dorsal hairs, and bicolor ventral coloration with a brown base and yellowish-brown tips, and further characterized by the plagiopatagium that was attached to the foot at the level of the base of the toes and the absence of a fringe of hairs along the edge of uropatagium (Fig. 1).The specimens have moderately developed sagittal and lambdoidal crests.In these specimens we observed that the second upper premolar was displaced to the lingual side (Fig. 2), which is in agreement with López-

González et al. (2001).
Myotis riparius can be distinguished from M. nigricans, M. levis, and M. albescens by the presence of a sagital crest in the skull, and from M. ruber because the fur on the uropatagium does not occur until the knee.It differs from M. simus by the presence of more long fur and a post orbital constriction that is less than 3.8 mm (Wilson 2008).Myotis riparius is smaller than M. izecksohni with a generally long and narrow skull, and differs from M. lavali by weakly bicolored dorsal fur and a slightly narrowed skull than M. lavali (Moratelli et al. 2011).

Discussion
Myotis riparius occurs in varied environments, from open and forested habitats to altered areas, undergoing large habitat plasticity (Novaes et al. 2017).The capture of the individual in the Reserva Particular do Patrimônio Natural do Caju, in an area associated with bodies of water, corroborates that reported by other studies, as this species is usually found in humid forested areas, forag-ing in environments close to water sources (e.g.Dias and Peracchi 2007, Wilson 2008, Lourenço et al. 2010, Maas et al. 2013, Tavares et al. 2017).The record of this species in areas of restinga has also been described in southern and southeastern Brazil by Luz et al. (2009) and Bôlla et al. (2017).
Myotis riparius is one of the most recorded species of aerial insectivores in understorey vegetation (Simmons andVoss 1998, Marques et al. 2016) and frequently coincides with other Myotis species (e.g.Simmons and Voss 1998, López-González et al. 2001, Dias and Peracchi 2008, Lourenço et al. 2010, Gregorin et al. 2011).In the 2 areas where it was recorded in Sergipe, this species coexisted with M. lavali.
In northeastern Brazil, M. riparius was documented in areas of Amazonian forest, Cerrado, Caatinga, and Atlantic Forest (Fig. 3).Our new records in Sergipe help fill  distribution gaps of this species in northeastern of Brazil, and expands the chiropterofauna to 55 species in the state (Rocha et al. 2017, Soares et al. 2017, Rocha et al. 2018).

Figure 2 .
Figure 2. Skull of a male of Myotis riparius (CMUFS 291) from Reserva Particular do Patrimônio Natural do Caju, Sergipe, Brazil. A. Dorsal view.B. Ventral view.The red arrow indicates P2 in the lingual position.