Medical Definition of ARTHRODESIS. : the surgical immobilization of a joint so that the bones grow solidly together: artificial ankylosis. the surgical immobilization of a joint so that the bones grow solidly together. ADVERTISEMENT.
Trapdoor spiders are not particularly harmful to man however, like Tarantulas, the tiny hairs on the legs of some species leave tiny red marks where the toothed hairs on the spiders' feet have clung to the skin. Mouse spiders are also a type of Trapdoor spider with huge chelicerae and may measure up to 35mm in body length.
Removal is not always required, as a sun spider can help reduce the population counts of other less desirable pests such as cockroaches and even smaller scorpions. They are not considered dangerous and are not venomous, however, they have a particularly strong jaw and may bite if provoked or feeling threatened. sun spider make for great pest control and are generally harmless to humans. A sun spider is not venomous, but they do have a very strong jaw and can cause a nasty bite if provoked. These jaws help them feed on an assortment of insects and plants.