Yellow Stingray, Urolophus jamaicensis. They are normally between 8 to 12 inches from head to tail.
I would recommend a 150 and up tank size for this yellow stingray (200 gallons is preferred) They do get around 10 inches in diameter (disc only). Yellow Stingrays are carnivores and they will scavenge the sandy bottom for any kind of meaty foods. They will eat small crustaceans.