What was Shelob, and more importantly, what was Ungoliant?

[obloquy]

Originally Posted by Gwathagor

I see Ungoliant as an anti-Bombadil because like Bombadil, Ungoliant appears to not be a specifically created being, but rather an embodiment of forces of nature. Only she's evil.

Why do Bombadil and Ungoliante appear not to be created? Iluvatar existed before all else and thus brought all else into being.