I made a subspecies of the xenomorph called Incubito Occisor (Incubating Murderer)
This creature is a bit different from the original xenomorph, rather having the face hugger they instead have a hammerpede like organism that has a spike tail that can paralyze the host that is kept in the adult form. Therefore the specimen goes inside the host to incubate itself from within. After it grow too big for the host, it burst out of the stomach and flees to a safe area. The host most likely won't wake up before the bith. in the adult form the tail can still paralyze any prey it hunts. The inner mouth rather going outward instead goes inward like the moray eels