Throughout the ages we have had Paranthropus boisei, Homo habilis, Homo erectus, Homo neanderthalensis and Homo sapiens / man / modern man and perhaps living on the fringes of enlightened man...
After years of intensive observation I have discerned "mental" sub species which most likely existed all along:
The feed, the herd, the herders, the kings and the gods.
I don't believe in 100% abstract nor do I believe anything to be 100% concrete.
My observations are refutable yet to the discerning mind, "Think" as you walk among your peers. You may find truth within this very short post.
Good night.