Glyphonycteris sylvestris (Thomas, 1896)

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 : 47-48

Glyphonycteris sylvestris (Thomas, 1896)

VOUCHER MATERIAL (TOTAL = 1): Nuevo San Juan (AMNH 15202); see table 23 for measurements.

UNVOUCHERED OBSERVATIONS: None.

IDENTIFICATION: Glyphonycteris sylvestris can be distinguished from other congeneric species by its tricolored dorsal fur, smaller size (forearm <44 mm, greatest length of skull <22 mm), two pairs of upper incisors that are nearly the same length as the canines, outer upper incisors that are almost hidden by the canine cingula in occlusal view, and lower incisors that are similar in anteroposterior and transverse dimensions (Williams and Genoways, 2008; López-Baucells et al., 2018). Descriptions and measurements of G. sylvestris were provided by Sanborn (1949a), Goodwin and Greenhall (1961), Swanepoel and Genoways (1979), Williams and Genoways (1980a), Simmons (1996), Simmons and Voss (1998), Lim et al. (2005), and Morales-Martínez and Suárez-Castro (2014). No subspecies are currently recognized (Williams and Genoways, 2008).

Fleck et al. (2002) correctly identified the specimens from Nuevo San Juan as Glyphonycteris sylvestris . Their voucher material conforms to previous descriptions of G. daviesi , with measurements that fall within the range of size variation previously documented for the species.

REMARKS: The single specimen of Glyphonycteris sylvestris from our region was part of a roosting group that occupied the rotted-out central cavity of a large standing tree in primary upland forest; many bats were observed to be roosting about 20 m above the ground in the hollow interior, of which only this adult male was collected on 19 October 1999.

In addition to our observation from Nuevo San Juan, several other reports (Goodwin and Green-

TABLE 23

External and Craniodental Measurements (mm) and Weights (g) of Glyphonycteris daviesi , G. sylvestris ,

and Trinycteris nicefori from the Yavarí-Ucayali Interfluve

hall, 1961; Handley, 1976; Williams and Genoways, 1980a) suggest that hollow standing trees are typical roosts of Glyphonycteris sylvestris .