"Man" and races of Eorzea
It has been mine and a few others' assumptions that the races in Eorzea are all considered the same species. NPCs such as the Primals refer to all of the PC races as "Man" and the fact that there is the assumption that cross-race bred characters are also able to breed is another. So far, what we know of the reason why it is low is because of cultural frowning upon. Nothing to state it's because it would produce sterile children, etc.
Or are they different species that "Man" is used abstractly?