Captain Nagisus
Jake the Dog!
Argonians aren't of the races of man and mer. If you mean the rest of the races of Nirn, that would include not only the Argonians but the Khajiit, the Imga, the Sload, the Dov, the Ka Po' Tun, the Kamal, the Tang Mo, the Tsaesci and maybe others.
The races of Man and Mer aren't descended from the enemies of the Eight. The Ehlnofey are the survivors of Creation, the child of Nir and Anu. The Eight spawned from the combined blood of Anu and Padomay while the blood of Padomay alone spawned the Daedra (this can all be read in The Anuad Paraphrased, a copy of which is in the living area of High Hrothgar)
I meant races of Tamriel. By which I meant, the ones that appear in the game. So not the Imga and all that. Thanks for pointing that out.
And hm. I guess UESP was wrong, and maybe I skimmed a bit when I read the Monomyth.