von Phasmid » 8. Apr 2009 09:48
Could just be an old damaged worker, happens occasionally. I find I have to be really careful when putting large food in items that could injure/crush ants, such as a twig in a bottle of water (to keep leaves fresh), as there are always loads of workers just where you want to put it. Here it looks like damage to the thorax has drawn the legs up.
Other than simple injury, I don’t know what is wrong with that worker.