Myotis riparius Handley, 1960

Velazco, Paúl M., Voss, Robert S., Fleck, David W. & Simmons, Nancy B., 2021, Mammalian Diversity And Matses Ethnomammalogy In Amazonian Peru Part 4: Bats, Bulletin of the American Museum of Natural History 2021 (451), pp. 1-201 : 137-138

Myotis riparius Handley, 1960

Figure 34C

VOUCHER MATERIAL (TOTAL = 20): Isla Padre (MUSM 4356, 4363), Jenaro Herrera (CEBIO- MAS 115; MUSM 5512, 5515, 5520, 5524, 5527, 5532, 5599, 5600, 5603, 6662), Nuevo San Juan (AMNH 272742, 272752; MUSM 13223, 13224), Quebrada Blanco (MUSM 21342, 21343, 21345); see table 61 for measurements.

UNVOUCHERED OBSERVATIONS: None.

IDENTIFICATION: Myotis riparius is distinguished from other congeners by its long, woolly fur; unicolored dorsal fur; plagiopatagium attached to the foot at base of digit I; fringe of hairs absent along the trailing edge of uropatagium; sagittal and lambdoidal crests forming a triangular “helmet” at their juncture in the interparietal region; and occip-

TABLE 61

External and Craniodental Measurements (mm) and Weights (g) of Myotis

riparius and M. simus

from the Yavarí-Ucayali Interfluve

ital region flattened posteriorly (Handley, 1960; Novaes et al., 2017). Descriptions and measurements of M. riparius were provided by Handley (1960), LaVal (1973), Brosset and Charles-Dominique (1990), Simmons and Voss (1998), Lim et al. (1999, 2005), López-González et al. (2001), Moratelli et al. (2013), Novaes et al. (2017), and Velazco and Patterson (2019). No subspecies are currently recognized (Novaes et al., 2017), but molecular data suggest the presence of cryptic diversity, and a comprehensive revision of the species is needed (Larsen et al., 2012).

Ascorra et al. (1993) identified their specimens from Jenaro Herrera either as Myotis riparius (MUSM 5603, 5212, 5215) or M. simus (MUSM 5520, 5524, 5599, 5600). Fleck et al. (2002) correctly identified their specimens from Nuevo San Juan. The voucher material that we examined from the Yavarí-Ucayali interfluve conforms to previous descriptions of M. riparius , with measurements that fall within the range of size variation previously documented for the species.

REMARKS: All of the nine recorded captures of Myotis riparius accompanied by ecological information from our region were taken in groundlevel mistnets, seven of them in primary forest and two in secondary vegetation.

Figures

FIG. 34. Photographs of A, an