Stone mites

These insectoid creatures infest both cities and starships, and eat into metal plating with a combination of their powerful jaws and acid saliva. Their metabolism is fueld by electrolytic reactions, and this can be seen in their feeler tails, which are capable of delivering mild electric shocks. They are uncommon in that they are usually seen in trionts (groups of three individuals linked by an exoskeleton). The only effective method of getting rid of a stone mite infestation is to use an oxidiser foam to rust them to death. Maany believe that these insectoids are the result of genetic engineering.