My Protomorph Theory

Oh, and to add on, the hammerpede has nothing to do with the Xeno, proto, or neomoprh life cycle. The worms are naturally occurring (maybe to that planet or from another engineer planet and somehow they go onto the ship) but then exposed to the black goo mutating them into that. Thats why they have acid blood and distinctions like a facugger... kind of.

The Black Goo is the Key....

Depends how they are going with this now, as before it was we had a Sacrificial Goo that when used on a ORGANISM or Organic Life... it would break this down so that its DNA is then reformed into a Mutagenic Substance that evolves other Organic Life it comes into contact with and passes on traits from the Organic Life that had been in contact with the Sacrificial Substance.

So Sacrificial Goo + Wolf would give a substance that passes on Wolf DNA to what ever it comes into contact with, how much depends on how they come into contact with it... But this plus a Human would create something like a Werewolf, if it was a Turtle that was infected with Sacrificial Goo, then the resulting mutagen would then evolve a Human to a TMNT lol

If you get what i mean?

So in this theory, which i think was correct at time they worked on Prometheus and its basically similar to Spaights Nano-Scarabs.

Means the Black Goo came from either.

1) Xenomorph

2) Xenomorph related ancestor

3) or some other Organism.

via which ever one of these being introduced with he Engineers Seeding Tool the Sacrificial Goo, and the Process could be a multiple one which i will explain latter.

And in the case of 2 and 3 eventually via different ways or experiments we get to a Xenomorph.

But who knows now as it depends how they intend to show us the Two Types of Goo... they could now be showing us there was ONLY One kind of Goo.

i will be busy today but i will give a in depth look at your theories and try and come up with some explanations.

I however have a feeling the Hammerpedes are the Answer.

I REALLY don't  like the "Black Goo" being so integral to this stuff. The X-Files series and movie already used the "Black goo" to death. I cringed when I saw it in Prometheus, and I'm hoping against hope that it'll not be such a big part in future prequels...preferably not at all a part.

@Starlogger yah good point, x-files used it pretty cool, love that show. Its definitely going to be in A: C, its used as a main plot device... its mainly like the whole movie