An Alien Prime to help keep the swarm in order? Weyland-Yutani would be impressed.
The model I used as a basis for this Tyranid prime, is an Inquisitor-scale Genestealer. I replaced the head with a Carnifex "acute senses" bit, with a Tyrgon head-frill. I also extended the tail using the new Hive Tyrant tail component:
This model is based on the required 40mm base, and fits with the rest of my Aliens themed swarm.