If only, The Pathogen makes for superb variety.
Valleys of petrified corpses, exploding humans and animals, every kind of Neomorphic being you can imagine whether human or animal.
Variations of Neomorph itself from Motes and Pods, variations of Trilobite depending upon whether from a human or the type of animal, variations on the Deacon.
And none of it, undermines the singular Alien.