I'm in trouble and you think my CV is important? There are far more pressing issues to deal with.

By now you've realized which species I'm studying. But I'm intrigued by the entire animal kingdom.
My favorite fish doesn't have it but others do - pterois volitans, dasyatidae, come to mind.
In Papau New Guinea, you'll find the only two of these that can claim it. What are they?

(And remember -- I'm a scientist. No common names here.)

Got the answer? Then you've got a clue. Enter it here.