Vampyressa thyone Thomas, 1909

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 : 117-119

Vampyressa thyone Thomas, 1909

Figure 28A

VOUCHER MATERIAL (TOTAL = 36): Boca Río Yaquerana (FMNH 89053–89056, 89139, 89140), Estación Biológica Madre Selva (MUSM 33327), Jenaro Herrera (AMNH 278511; CEBIOMAS 113, 114; MUSM 4223), Quebrada Betilia (MUSA 15189–15191), Quebrada Blanco (MUSM 21185), Quebrada Esperanza (FMNH 89059–89067, 89141, 89143, 89145), Quebrada Lobo (MUSA 15112, 15126, 15129, 15137, 15138), Quebrada Sábalo (MUSA 15214, 15215), Quebrada Vainilla (LSUMZ 28439), Santa Cecilia (FMNH 87103); see table 51 for measurements.

UNVOUCHERED OBSERVATIONS: Vampyressa thyone (identified as V. pusilla ; see below) was captured at Divisor (one individual) and Tapiche (one individual) during the Sierra del Divisor Rapid Biological Inventory (Jorge and Velazco, 2006).

TABLE 51

External and Craniodental Measurements (mm) and Weights (g) of Vampyressa thyone

and Vampyrodes caraccioli from the Yavarí-Ucayali Interfluve

IDENTIFICATION: The genus Vampyressa includes six currently recognized species (Simmons and Cirranello, 2020; Morales-Martínez et al., 2021), only one of which is known from the Yavarí-Ucayali interfluve. Vampyressa thyone (formerly often confused with V. pusilla , a southeastern Brazilian and Paraguayan species; Lim et al., 2003) can be distinguished from other stenodermatines by the following characteristics: small size (forearm <34 mm, greatest length of skull <19 mm); presence of inconspicuous facial stripes and lack of a middorsal stripe; uropatagium narrow and sparsely haired; rostrum shorter than braincase; hard palate extending well behind the molars; long upper inner incisors separated basally but converging at their bifid tips; first upper premolar smaller than the second; and first lower premolar caniniform and smaller than the second (Arroyo-Cabrales, 2008b). Descriptions and measurements of Vampyressa thyone have been provided by Good- win (1963), Ceballos-Bendezú (1968), Lim et al. (2003), Tavares et al. (2014), and Velazco and Patterson (2019). No subspecies are currently recognized (Arroyo-Cabrales, 2008b), but venilla Thomas, 1924 (a synonym), was formerly used as such (e.g., by Ceballos-Bendezú (1968).

Ceballos-Bendezú (1968) and Medina et al. (2015) correctly identified their specimens from Boca Río Yaquerana, Quebrada Esperanza, Quebrada Betilia, Quebrada Lobo, and Quebrada Sábalo. The voucher material that we examined from the Yavarí-Ucayali interfluve conforms to previous descriptions of Vampyressa thyone , with measurements that fall within the range of size variation previously documented for the species.

REMARKS: Only seven recorded captures of Vampyressa thyone are accompanied by ecological data from our region, including five that were made in ground-level mistnets and two in elevated nets. Of these mistnet captures, two were made in primary forest, another two in secondary vegetation, and three in clearings.

Figures

FIG. 28. Photographs of A, an adult Vampyressa thyone captured at Jenaro Herrera; B, an adult Vampyriscus bidens captured at El Chino Village; and C, an adult Vampyriscus brocki captured at Jenaro Herrera. Photographs by Marco Tschapka (A, C) and Brock Fenton (B).