I was wondering...
I didn't know that I. iguana rhinolopha was dropped, but I did know that the two subspecies were interbreeding so much that some of the offspring had the medial row of horns and some did not, making them virtually indistinguishable.
It really got me thinking about my juvenile ig. He has the medial row of horns, and he's from a Miami 'store' of sorts. I imagine that he's probably wild caught and not imported. So....would he be I. iguana rhinolopha, an intergrade, I. iguana, or would it really matter? 
