Sorry Oscar, but not all Annona species are called Chirimoya in Cuba. A. squamosa is Anon, A. muricata is guanabana, A. reticulata is chirimoya roja, Atemoya is Atemoya, and A. cherimola is Chirmoya verde.
I am not saying they are a common occurance, but fruiting Cherimoyas do exist in Miami and the next time I see one I promise to take a picture.