-Bloo-,
Undefined,
12 years ago
We assume that a Xeno can be made from pretty much anything, it's just that the Protomorph wasn't planted by a standard Facehugger, so it wasn't exactly a Xenomorph.
What I mean is, even though different hosts produce different types of Xenos, they're still pretty much the same other than color and size. This thing was a space dinosaur with a completely different second jaw.
My own theory (and this is fan wankery at its finest) is that, since it was so huge, it was the first Queen. I know Dave doesn't support the whole hive thing, so if it's not a Queen, it's still the Xenomorph's direct predecessor.