menchacai, Potamotrygon Martínez Achenbach [G.] 1967:1, Pls. 1-3 (pp. 6-8) [Comunicações del Museo Provincial de Ciencias Naturales "Florentino Ameghino," Zoología No. 1; ref. 26257] Río Colastiné, Paraná Média, Santa Fe Province, Argentina. Holotype: MFA 289. See Carvalho 2001:1168 [ref. 26256]. •Synonym of Potamotrygon falkneri Castex & Maciel 1963 -- (authors, Carvalho et al. in Reis et al. 2003:24 [ref. 27061], Mirande & Koerber 2015:8 [ref. 35117], Weigmann 2016:155 [ref. 34211]). Current status: Synonym of Potamotrygon falkneri Castex & Maciel 1963. Potamotrygonidae: Potamotrygoninae. Habitat: freshwater.