system
Given the following post, respond as if you're commenting on Reddit:
human
[Aliens] Are there different xenomorph species?

In the 1979 film, the alien is a silver headed creature with a normal-ish tail and can apparently use humans to create eggs(in the extended cut at least). 
But, in the 1986 movie, the alien warriors are rigged headed and have large spear-head like tail ends. These aliens also have a queen which apparently lays all the eggs.
Are these examples of different xenomorph sub-species? If so, how do they react with each other and are there any others?
gpt
Well, there are different sub species in the sense that each warrior or drone "born" of different host species will express a phenotype based on the host species, suggesting that they incorporate dna from the host. Consider the human spawned xenos in 1,2 vs the dog/ox Xeno in 3 and the predalien in the movie that should not be named.

Iirc, the differences between Kane's baby and the xenos on lv426 have been stated to be attributable to the maturity of the critters. The ones on lv426 had been alive much longer, and perhaps their carapaces continue to harden.