circularis, Potamotrygon Garman [S.] 1913:419, Pls. 31 (1-2), 54 (1), 70 (1-2) [Memoirs of the Museum of Comparative Zoology v. 36; ref. 1545] Río Solimões, Tefé and Lago Coari [on Río Solimões], Brazil. Syntypes: MCZ 291-S (1) Tefé, 295-S (1) Coari. Non-type: MCZ 296-S (1). Type catalog: Hartel & Dingerkus 1997:xliii-xliv [ref. 23119]. Castex 1964:28 [ref. 20924] said there was a holotype and a paratype at MCZ. •Valid as Potamotrygon circularis Garman 1913 -- (Castex 1964:27 [ref. 20924]). •Synonym of Potyamotrygon motoro (Müller & Henle 1841) -- (in part, authors, Carvalho et al. in Reis et al. 2003:24 [ref. 27061]). •Synonym of Potamotrygon constellata (Vaillant 1880) -- (in part, authors, Carvalho et al. in Reis et al. 2003:24 [ref. 27061], Weigmann 2016:154 [ref. 34211] see remarks, Carvalho 2016:55 [ref. 34730]). Current status: Synonym of Potamotrygon constellata (Vaillant 1880). Potamotrygonidae: Potamotrygoninae. Distribution: South America. Habitat: freshwater.