This is a Yellow Stingray (Urolophus jamaicensis), something I don't often see around Little Cayman. Wesley found this one in a small cave at Coconut Walk and he waited very patiently while I got close enough for a decent shot. These are very small rays, normally reaching a maximum of 15" across.
Here's another Yellow Stingray I found on the way back from Donna's Delight. He was hiding under a big coral head. I thought this photo was amusing because of the Soapfish hiding behind him. I didn't even notice that until I looked at the photo later!