The Antlions in Half-Life 2:
bear a strong resemblance to the Starship Troopers Warrior Bug
Although these pictures don't convey the resemblance very well, especially when in swarms antlions are virtually indistinguishable from Warrior Bugs.
I'm aware I am not the first to notice that similarity, but I was unable to find any official sources that indicate an actual influence of the first Starship Troopers film when designing the Game.
Is there any source (e.g. interview, article, ...) that would support this theory?