Platyrrhinus dorsalis ( Thomas, 1900 )

Velazco, Paul M., Ly, Grace, McAllister, Julia & Esquivel, Diego A., 2023, Geographic variation in select species of the bat genus Platyrrhinus, Therya 14 (1), pp. 121-130 : 128

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) .