My guess would be Potmotrygon marinae.
http://www.fishbase.org/Photos/PicturesSummary.php?ID=62660&what=species
http://www.fishbase.org/summary/speciessummary.php?id=62660
http://www.iucnredlist.org/apps/redlist/details/161362/0
It looks very similar to the pictured ray as far as pattern, disc shape and tail structure goes.
According the the links above, P. marinae is found in French Guyana. Perhaps they are also native to the upper Rio Negro.
I want a pair!
http://www.fishbase.org/Photos/PicturesSummary.php?ID=62660&what=species
http://www.fishbase.org/summary/speciessummary.php?id=62660
http://www.iucnredlist.org/apps/redlist/details/161362/0
It looks very similar to the pictured ray as far as pattern, disc shape and tail structure goes.
According the the links above, P. marinae is found in French Guyana. Perhaps they are also native to the upper Rio Negro.
I want a pair!