i know that the anatomies are very derp here but i was focusing more on trying to get this idea out on paper

BASICALLY this is a parasite that consumes the victim's head. at some point during this process the lower jaw is removed, so that grabby tentacles/ovipositors/other unpleasant internal organs can more easily slip in and out, and to make it easier to scarf down prey.

by the way the parasite is sentient. !t +aLks l1kÉ ThiS... ÆehÊhëÉ....