The Spider Alien looks interesting, but what purpose would this be?
I can only think of it being similar to the Trilobite and by that some kind of Face Hugger type Organism and showing the Black Goo leads to a Face Hugger Type Organism... which means the Spider Face Hugger has to then INFECT a Host?
If this was the idea, no wonder they canned it simply maybe because it added another Cycle to the Life Cycle and they felt a Infection that leads directly to a Chest Buster type Organism (Chest Buster) would be more interesting.
Saying that Jon Spaights Holloway infection appeared as some kind of Trilobite like Creature to a degree, well with a Head and so like a Tentacles version of this Spider Alien... and Spaights Chest Buster evolved into something that looked different to its more Trilobite like Chest Buster Stage (did not act as a Face Hugger).