DarkFather said:
you also have to note that Vulcans and Romulans are the same species.
Negative. They are relative by a common ancestor. I do not believe Vulcan physiology is identical to that of Romulans.
What's the difference? Are you and I related by a common ancestor? If so, does that make us separate species? If I recall correctly, it had only been a few hundred years since the Romulans and Vulcans broke off (but feel free to correct me)... far too short a time for any significant evolutionary factors to change them into individual species.