Geographic variation in select species of the bat genus Platyrrhinus Author Velazco, Paul M. 0000-0001-7195-7422 Department of Biology, Arcadia University, Glenside, Pennsylvania 19038, United States. & Department of Mammalogy, American Museum of Natural History, New York, New York 10024, United States. velazcop@arcadia.edu Author Ly, Grace Department of Biology, Arcadia University, Glenside, Pennsylvania 19038, United States. gly@arcadia.edu Author McAllister, Julia Department of Biology, Arcadia University, Glenside, Pennsylvania 19038, United States. jmcallister_02@arcadia.edu Author Esquivel, Diego A. Programa de Pós-GraduaÇÃo em Biologia Animal, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul 91501 - 970, Brasil. & Fundación Kurupira, Bogotá, Cundinamarca 110921, Colombia. diegodaem@gmail.com text Therya 2023 2023-01-30 14 1 121 130 http://dx.doi.org/10.12933/therya-23-2208 journal article 10.12933/therya-23-2208 10261435 Platyrrhinus dorsalis ( Thomas, 1900 ) Synonyms Vampyrops dorsalis Thomas, 1900:269 . Type locality: ‘‘ Paramba , [ Imbabura ,] N. Ecuador . Alt. 1,100 m .’’ Platyrrhinus chocoensis Alberico and Velasco, 1991:238 . Type locality: Quebrada El Platinero , 12 km W Istmina (by road), Department of Chocó , Colombia . Distribution . Platyrrhinus dorsalis occurs at elevations from sea level to above 2,000 m from southern Panama southward into Colombia and along both slopes of the Andes in Ecuador . Diagnosis . Lowland populations assigned to chocoensis are medium-size bats (FA [forearm length] 46.9–50.7 mm; CIL [condyloincisive length] 24.3–26.6 mm; Velazco and Gardner [2009] : table 3) characterized by a pale brown dorsal coloration, brownish and bicolored ventral fur; wellmarked folds in the pinnae; fossa on the squamosal end of the zygomatic arch lateral to the glenoid fossa absent or almost imperceptible; stylar cusp on the lingual face of the M2 metacone absent;only the labial cingulid present on the second lower premolar; and stylid cusp between the metaconid and protoconid of the m2 usually absent. In contrast, mid to high elevation populations assigned to dorsalis are medium-size bats (FA 46.6–49.5 mm, CIL 24.1–26.3 mm; Velazco and Gardner [2009] : table 3) characterized by a dark brown dorsal coloration, brownish and tricolored ventral fur; poorly marked but distinguishable folds in the pinnae; deep fossa on the squamosal end of the zygomatic arch lateral to the glenoid fossa; stylar cusp on the lingual face of the M2 metacone present; both labial and lingual cingulids present on the second lower premolar; and stylid cusp between the metaconid and protoconid of the m2 present. Remarks . Linear morphometric analyses did not reveal secondary sexual variation among populations of chocoensis or dorsalis ( Palacios-Mosquera et al. 2020 ) . The PCA showed that populations of chocoensis and dorsalis form two clusters in morphospace ( Palacios-Mosquera et al. 2020 : fig. 2), with individuals of chocoensis being larger than dorsalis . Molecular analyses recovered specimens of chocoensis nested within a larger clade that included specimens only of dorsalis ( Palacios-Mosquera et al. 2020 ) .