Maras are also hosts for parasites such as the nematode worm "Wellcomia dolichotis". Hibernating queen bumble bees are parasitized by a nematode worm, "Sphaerularia bombi". It is a parasitic nematode worm and commonly known as the Old World hookworm. The "G. pulchrum" parasite is a nematode worm of the order Spirurida. In the nematode worm "Caenorhabditis elegans", meiotic double-strand breaks (DSBs) outnumber COs.