My take on this: the line "one of those whom he had corrupted to his service" strongly suggests Ungoliant is an Ainu (if not necessarily a Maia). I think you have to really strain to make it mean anything else.
However, I also believe that is a fairly late concept on Tolkien's part, and that in earlier versions his spider-monster was a being created of darkness or mist or whatever. This is just from memory, though.
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