The Raspy River Stingray- Potamotrygon scobina. So often people buy their Stingrays blindly! I have lost count of the sheer number of messages I receive asking me to identify a particular Ray that someone has purchased already, asking what species and how big will it will eventually grow. The truth is in most cases these are Thai imports, not to mention hybrids. Often nice looking Rays to be fair, however! as to what species were involved in making a particular Ray is anyone’s guess, the shipper