Micronycteris (Micronycteris) matses Simmons et al., 2002

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 : 58

Micronycteris (Micronycteris) matses Simmons et al., 2002

VOUCHER MATERIAL (TOTAL = 9): Nuevo San Juan (AMNH 272814, 273043, 273044, 273095, 273133, 273196; MUSM 15229, 15231), Quebrada Pantaleón (MUSA 15251); see table 27 for measurements.

UNVOUCHERED OBSERVATIONS: None.

IDENTIFICATION: Micronycteris matses is only known from the Yavarí-Ucayali interfluve, although it is probably more widely distributed in western Amazonia (Simmons et al., 2002; Medina et al, 2015). This species can be distinguished from other congeners by the following combination of characteristics: dark-brown dorsal and ventral fur, ears connected across the crown by a low interauricular band of skin with a shallow midline notch, short (≤ 3 mm) fur on the leading edge of the pinna, forearm 38–40 mm, greatest length of skull 19.8–20.8 mm, and lower incisors broad and low crowned (table 27; Simmons et al., 2002). Descriptions and measurements of M. matses were provided by Simmons et al. (2002) and Medina et al. (2015). No subspecies are currently recognized (Simmons et al., 2002; Williams and Genoways, 2008).

Specimens of Micronycteris matses from Nuevo San Juan were identified as Micronycteris “ new species” by Fleck et al. (2002). Medina et al. (2015) correctly identified the specimen from Quebrada Pantaleón as M. matses .

REMARKS: We mistnetted one specimen of Micronycteris matses in the understory of upland primary forest near Nuevo San Juan, but the other seven specimens from this locality were taken at roosts. We found four roosting groups here, all of which occupied deep holes in the sides of dry gullies in primary forest (Simmons et al., 2002). These holes were either old armadillo ( Dasypus pastasae ) burrows, or cavities resulting from soil erosion (but perhaps originally excavated by armadillos). The first of these roosts, encountered on 4 September 1999, was in hillside forest and contained an unknown number of bats ; two adult female M. matses were col- lected here, together with specimens of Peropteryx pallidoptera and Carollia brevicauda . The second roost, encountered on 16 September 1999, also in hillside forest, contained five individuals, of which one adult female was collected. The third roost, encountered on 6 October 1999, was in floodplain forest and contained many bats, of which only one adult male and one adult female Micronycteris matses were collected. The fourth roost, encountered on 9 November 1999, was in upland forest and contained seven individuals, of which one adult male and one adult female were collected .