The Judas Breed have eight legs!
I noticed that the Judas Breed, as opposed to other insects, have eight legs instead of six. You'll notice it in the scene where the Judas is cut in two when they hide in the old subway car. When Manny looks at the half laying outside, there are four legs on it. And the half that is inside the subway car also has four- one pair with pincers and one pair with face plates.
I know it is possible for the Judas Breed to develope an extra set of legs, but I thought it was a bit unlikely, as all creatures that they had DNA from- cockroaches, praying mantises and termites- had six legs.
''De Cock, with C-O-C-K''