Because Mother Nature clearly has way too much time on her hands, this is a species of fruit fly that's evolved realistic looking pictures of jumping spiders on its wings. Impressive, but I'd still like to see a pair of those naked lady trucker mudflaps.
The idea of the ant design, as explained to The National by Dr Brigitte Howarth of Zayed University who first discovered G tridens in the UAE, is that these flies use their wings to ward off predators. The fly flashes it wings back and forth to make it seem as if the ants [or spiders] are moving around and that movement would confuse the predator.
Man, if I were a fruit fly you know what I'd want on my wings to ward off predators? GUNS. Not pictures of guns either, actual f***ing guns. Oh shit, you wanna eat me? *PEW PEW PEW!* I don't think so. Ideally I wouldn't want to be a fruit fly at all though.
Thanks to peacedove, who's often depicted with an olive branch in its beak even though it was really a marijuana leaf.