Glossophaga bakeri Webster and Jones, 1987

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 : 43-45

Glossophaga bakeri Webster and Jones, 1987

Figure 10C

VOUCHER MATERIAL (TOTAL = 7): Isla Muyuy (MUSM 21150–21156); see table 22 for measurements.

UNVOUCHERED OBSERVATIONS: We captured two individuals Glossophaga bakeri at Tahuayo Farm on 19 February 2019 and another four individuals at El Chino Village on 21 February 2019.

IDENTIFICATION: Glossophaga bakeri was originally described as a subspecies of G. commissarisi based on seven specimens from Amazonian localities in Brazil, Colombia, and Peru. Webster (1993) subsequently delimited two other subspecies: G. c. commissarisi , distributed from southeastern Mexico to southern Panama, and G. c. hespera, which occurs only in western Mexico. Our review of voucher material from the Yavarí-Ucayali interfluve together with specimens from other subspecies of G. commissarisi and other South American species of Glossophaga suggests that bakeri should be recognized as a distinct species.

Descriptions and measurements of Glossophaga bakeri (as G. commissarisi bakeri ) were provided by Webster and Jones (1987) and Webster (1993). This is a medium-sized glossophagine with dark-brown dorsal fur. The dorsal hairs are bicolored, with a long, light-brown base (comprising about 90% of the length of each hair) and a short, dark-brown terminal band. The ventral fur is similar to the dorsal fur in coloration, with the exception of the terminal band, which is paler than the terminal band of the dorsal fur. The dorsum of the uropatagium is naked, the calcar is shorter than the hind foot, and the dorsal surface of the foot is sparsely covered with short hairs. The dermal pads on the chin are separated by a wide cleft and the rostrum is short and wide. The presphenoid ridge (or keel) is

TABLE 22

External and Craniodental Measurements (mm) and Weights (g) of Glossophaga bakeri

and G. soricina from the Yavarí-Ucayali Interfluve

weakly developed. The upper and lower incisors are evenly spaced, and the upper canine and each of the upper premolars are separated from one another by gaps (diastemata). The second upper premolar has a well-developed posterior cusp, the upper and lower molars are robust, and the M1 parastyle is moderately developed.

Glossophaga bakeri is morphologically distinct from G. commissarisi . Externally, the dermal pads on the chin of Glossophaga bakeri are separated by a wide cleft, whereas the homologous cleft is narrower in G. commissarisi . Cranially, the presphenoid ridge (or keel) is weakly developed in G. bakeri , whereas it is flattened in G. commissarisi . Dentally, the upper incisors in G. bakeri are evenly spaced, whereas in G. commissarisi the inner upper incisors are in contact or almost in contact with each other. The lower incisors of G. bakeri are evenly spaced, whereas they are separated into two pairs by a conspicuous gap in G. commissarisi . The second upper premolar of G. bakeri has a well-developed posterior cusp, whereas accessory cusps are absent in G. commissarisi . The parastyle of M1 is reduced in G. bakeri , whereas it is well developed and directed posterolabially in G. commissarisi .

Thus restricted, Glossophaga commissarisi is known only from Middle America, whereas G. bakeri is endemic to western Amazonia; both species cooccur with the ubiquitous G. soricina (see below), which is the only other congener known to occur in eastern Amazonia. Although Griffiths and Gardner (2008a: 239) reported a specimen of G. commissarisi from Guyana, we examined the specimen in question (USNM 565513) and reidentified it as G. soricina . 6 In the absence of any clear pattern of geographical variation, we do not recognize any subspecies of G. bakeri .

REMARKS: The two specimens of Glossophaga bakeri from Tahuayo Farm were taken in groundlevel mistnets in old secondary vegetation. We used hand nets to capture four males that were members of a single roosting group of about a dozen individuals in an abandoned concrete building at El Chino Village. No natural roosts of this species were encountered during our study.

Figures

FIG. 10. Photographs of A, an adult Anoura caudifer captured at Quebrada Blanco; B, an adult Choeroniscus minor captured at Quebrada Blanco; C, an adult Glossophaga bakeri captured at El Chino Village; and D, an adult female (ROM 122150) G. soricina captured at Jenaro Herrera. Photographs by Marco Tschapka (A, B), Brock Fenton (C), and Burton Lim (D).