User blog comment:Tvirus1234/What if Javik isn't an actual Prothean?/@comment-4961148-20130602213036

It could be that 'Prothean' is not a species as much as a culture, with many different sapients united under that banner. Somewhat analogous to an idealised melting-pot society composed of various ethnic groups who identify as one nationality.

N.B.: I am not implying that different human ethnicities are equivalent to different (sub)species.