Viciator
The Viciator is a massive Tyranid Biotitan akin to the more well-known Hierophant. While less known, the Viciator have been identified with its huge crushing claws or long scythe-like blades, cluster spines and other bio-weapons. How the Tyranids have developed such large biological constructs without collapsing on itself via the square cube law remains a mystery to the Imperium's Xenos Biologis.
Smaller than a Hierophant, supposedly a tank/armor hunter. The Viciator is one hideous monstrosity that yet again, took another page out of Ridley Scott's Aliens. What with its secondary jaw look-a-like, you would think that the Genestealers was an enough homage to one of the granddaddies of Sci-Fi horrors. Even more obviously, it's mandibles probably reference Predator.
Other then its humongous mouth and giant scything talons and other bio-weapons, the Viciator is also identified with its somewhat hilarious feet not unlike giant stilettos or high-heels. Never knew the Hive Mind had a fetish for Drag...