{{Speciesbox | image = | status = EN | status_system = IUCN3.1 | status_ref = <ref name="iucn">{{cite iucn |author=Fontenelle, J.P. |author2=Sayer, C. |author3=Fernando, E. |year=2025 |title=''Potamotrygon adamastor'' |volume=2025 |article-number=e.T188060303A271884545 |doi=10.2305/IUCN.UK.2025-2.RLTS.T188060303A271884545.en |access-date=22 February 2025}}</ref> | genus = Potamotrygon | species = adamastor | authority = Fontenelle & Carvalho, 2017 }}
'''''Potamotrygon adamastor''''', the '''Branco River freshwater stingray''', is a type of freshwater tropical ray found exclusively in the state of Roraima, Brazil.<ref name="iucn"/><ref name=":12">{{Cite journal |last1=Fontenelle |first1=João Pedro |last2=De Carvalho |first2=Marcelo R. |date=2017-08-21 |title=Systematic revision of the ''Potamotrygon scobina'' Garman, 1913 species-complex (Chondrichthyes: Myliobatiformes: Potamotrygonidae), with the description of three new freshwater stingray species from Brazil and comments on their distribution and biogeography |url=https://www.mapress.com/zt/article/view/zootaxa.4310.1.1 |journal=Zootaxa |volume=4310 |issue=1 |doi=10.11646/zootaxa.4310.1.1 |issn=1175-5334|url-access=subscription }}</ref>
== Description == This species can be distinguished from its congeners through several characteristics, such as dark gray dorsal disc; body covered with small yellow-white ocelli with a slender dark contour; small irregular spots on disc margin (sometimes); and robust and wide tail base.<ref name=":12" />The size of this tropical stingray ranges from {{cvt|45|to|62|cm}} disc width (DW).<ref name="iucn" /><ref name=":12" />
== Habitat & distribution == It is endemic to a single locality of Uriracuera river, an upper branch of Rio Branco river system, Roraima, Brazil.<ref name="iucn" /><ref name=":12" /> This demersal species tends to inhabit the turbid wetlands with sandy sediments.<ref name="iucn" /> The only threat to this species might be water contamination resulted from nearby illegal mining activities, as there are no records about its capture by fisheries.<ref name="iucn" />
== References == {{Reflist}}
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adamastor Category:Endemic fish of Brazil Category:Freshwater stingrays of Brazil Category:Fish described in 2017