IT was a spider like creature with pincers from its head, and later grew wings in the end battle ine arths atmosphere onboard some flying ahrvester machine....
Later rewrites had it more like newborn but it also grew wings later and wanted to mate with ripley 8...
Myself would had prefered it to be something like corporate hicks: a big chap but deadlier, or something new and deadlier than a normal xenomorph and way better than the newborn who beyond its strenght being a big downgrade.